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The Silent Epidemic Reshaping Our Faces and Health
Have you ever wondered why so many children today need braces, when our ancestors rarely suffered from crooked teeth? What if I told you that the way we eat, breathe, and rest our mouths is fundamentally altering our facial structure-and potentially endangering our health? In "Jaws," Sandra Kahn and Paul Ehrlich reveal a hidden epidemic sweeping through industrialized societies: the dramatic reduction in human jaw size that has occurred since the agricultural revolution and accelerated with industrialization.
This isn't merely a cosmetic issue. The consequences extend far beyond crooked teeth to include sleep disorders, breathing problems, and even cognitive impairment. The book has garnered attention from health professionals across disciplines, with Dr. Mehmet Oz calling it "a must-read for anyone interested in understanding why so many people today suffer from 'diseases of civilization' like sleep apnea and attention deficit hyperactivity disorder." What makes this work particularly compelling is how it connects evolutionary biology, anthropology, and modern medicine to explain a problem hiding in plain sight-one that affects nearly every family in the developed world.
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From Hunter-Gatherer Jaws to Modern Malocclusion
Our hunter-gatherer ancestors had spacious jaws with perfectly aligned teeth, including wisdom teeth that fit comfortably. Archaeological evidence shows that even ancient Egyptians 3,000 years ago maintained excellent dental alignment. What changed? The transition from hunting and gathering to agriculture began a gradual shift in human jaw development that accelerated dramatically with the industrial revolution.
George Catlin, a Philadelphia attorney and artist who documented Native American cultures in the 1830s, was perhaps the first to recognize this pattern. While living among the Mandan Indians, he observed their "almost unexceptional completeness and soundness" of teeth. More striking was his observation that Native Americans kept their mouths closed nearly all the time, while Europeans were called "black-mouths" by natives because their mouths were frequently open. This simple difference in oral posture had profound implications for development and health.
The problem isn't genetic mismatch-it's not that we're inheriting "dad's giant teeth and mom's dainty jaws" as is commonly believed. With rare exceptions, everyone is born with DNA programmed to develop properly sized jaws and teeth. As Dr. Hal Huggins humorously noted, "I never saw a mule with horses' teeth and a donkeys' jaw." The issue lies in how our modern environment interacts with our Stone Age genes.
Our DNA evolved over millions of years to produce jaws adapted to tough foods and hard chewing, with proper oral posture (closed mouth, tongue resting on the palate). When these same genes operate in an environment with soft foods and different resting positions, they produce dramatically different results-like changing the dimensions of a rectangle by altering either its length or width. The result is smaller jaws with insufficient room for all our teeth, leading to the epidemic of malocclusion we see today.
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The Dramatic Softening of Our Diet
The development of human diets shows a clear progression toward softer foods requiring less chewing. Our ancestors spent nearly half their day chewing tough foods-raw vegetables, nuts, seeds, and fibrous meats. The advent of cooking began to soften our diet, but the agricultural and industrial revolutions dramatically accelerated this trend.
The chronology of dietary softening reveals how quickly this change occurred. While honey was once a rare sweetener available only to the wealthy, the European occupation of the Caribbean and the exploitation of slave labor made sugar widely available by the 19th century. This period brought unprecedented increases in soft foods with the invention of meat grinders, mass-produced ice cream, commercial baby foods, and canned products.
Researchers like Weston Price and Robert Corruccini documented that indigenous peoples eating traditional diets rarely suffered from the tooth crowding and malocclusion common in Western societies. Even their wisdom teeth fit comfortably in their wider jaw arches. Comparative studies of families who moved from traditional to industrialized environments show dramatic changes in jaw development within just one or two generations.
Corruccini's research with squirrel monkeys confirmed that nutritionally equivalent diets differing only in required chewing effort produced significant differences in jaw development and tooth alignment. When fed processed soft foods, the monkeys developed many of the same dental problems seen in modern humans.
Modern evidence indicates that small jaws, not large teeth, underlie tooth crowding problems. Additionally, dietary changes have transformed our oral bacterial communities, favoring decay-causing bacteria that can further impact jaw development when painful cavities cause children to alter their chewing patterns. The conclusion is inescapable: the way we eat has fundamentally altered how our faces develop.
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The Triple Threat: Diet, Posture, and Indoor Living
The "Great Leap Forward" in human cultural evolution 70,000-100,000 years ago enabled rapid cultural changes without genetic evolution. While genetic changes typically require thousands of generations, cultural transformations can occur within a generation or less. For oral-facial health, three core areas of cultural shift have profoundly impacted modern humans.
First, what and how we eat has dramatically changed. Our jaws evolved for a Stone Age diet but exist in what might be called a "Big Mac environment." Modern soft foods like yogurt, applesauce, and peanut butter fail to provide necessary chewing resistance. Even well-intentioned parents who cut food into tiny pieces deprive children of the muscle exercise needed for proper jaw development. The shift to industrial diets has meant moving from tough meats and nuts to soft foods requiring minimal chewing. This lack of chewing exercise during childhood results in weaker jaw muscles and underdeveloped jaws.
Second, our prevailing oral posture has changed dramatically. Proper oral posture-mouth closed with teeth in light contact and tongue resting on the roof of the mouth-is crucial for jaw development. Without sufficient chewing of hard foods, jaw muscles weaken, leading to mouth hanging open. A child's oral posture determines facial growth direction, ultimate shape, and attractiveness. Small jaws indicate likely restricted airways, causing patients to tilt their heads back to breathe better.
Third, indoor living has transformed how we breathe. Over 50 percent of children have become habitual mouth breathers. Indoor environments concentrate allergens from pets, cockroaches, molds, and dust mites, increasing respiratory problems for some 60 million Americans. This environment increases viral transmission and nasal congestion, forcing mouth breathing. When the mouth becomes a breathing device rather than a chewing device, the maxilla narrows and develops a deep cleft.
The cycle often begins with allergies or nasal blockage, leading to mouth breathing, which adversely affects jaw development, creating smaller jaws and crowded teeth. Despite these concerns, addressing oral-facial health could significantly improve quality of life for millions of people.
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The Social Impact of Changing Facial Structure
While human life expectancy has dramatically increased, facial appearance has enormous social consequences. Unlike other primates where dominance is based on size and aggression rather than looks, humans developed aesthetic preferences after the Great Leap Forward enabled discussion about appearance. Evidence for this includes 75,000-100,000-year-old shell bead decorations and cave paintings from 20,000 years ago that we still find aesthetically pleasing.
Today's highly visual culture amplifies appearance's importance, with certain facial features generally considered attractive (balanced features, strong jawlines) or unattractive (receding chins). Surprisingly, facial structure isn't purely genetic-it's shaped by cultural habits like eating, breathing, and jaw positioning during development. Mouth breathing in children can lead to long, narrow faces, less defined cheekbones, small lower jaws, and weak chins that persist into adulthood.
Poor overall posture has become the norm in industrialized society, with studies showing 38% of Czech schoolchildren diagnosed with poor posture. Unlike a century ago when "good posture" received significant attention, today most people slouch and many mouth breathe when at rest. This lack of muscle tone leads to chronic health problems extending beyond just facial development.
Poor oral posture and mouth breathing can transform "cute" children into less attractive adults through what dentists call "long face syndrome"-excessive lengthening of the face with jaws and teeth set back. Historically, this wasn't always disadvantageous; the Duke of Wellington exemplifies an upper-class man with long face syndrome whose "Roman" nose was admired in his era.
In our highly visual society saturated with media images, people judged "beautiful" or "handsome" by Western standards gain significant advantages. The recent trend of paying inordinate attention to actors and models may obscure a society-wide decline in general attractiveness. Just as with the obesity epidemic, there is a building health epidemic signaled by reduced facial attractiveness, with collapsing facial profiles becoming more concave, retreat of cheekbones, softness in jawlines, crooked teeth, and mouth breathing-all because developing in the industrial environment has resulted in jaws with insufficient room for teeth and tongue.
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The Critical Role of Oral Posture in Development
Most people in industrialized societies no longer develop their jaws to their full potential size, resulting in insufficient space for all 32 teeth and proper tongue positioning. Poor oral posture-where the tongue sits low in the mouth rather than pressing against the roof with closed lips and light teeth contact-often becomes both cause and consequence of developmental problems.
The evolution of complex language 50,000-150,000 years ago gave humans tremendous advantages but required crucial changes in facial-airway configuration. The dropping of the larynx created a larger air space for speech but made humans vulnerable to choking as food and air began traveling down the same pipe. This anatomical shift that enabled human vocal language contributed to our vulnerability to breathing disorders like obstructive sleep apnea, though the modern epidemic has additional causes beyond this evolutionary adaptation.
Breastfeeding promotes proper craniofacial development through intense exercise of orofacial muscles, stimulating breathing, swallowing, chewing and speech production. Scientific literature shows lack of breastfeeding correlates with jaw underdevelopment, mouth breathing, and malocclusion. The industrial revolution dramatically changed infant feeding patterns as women entered the workforce, leading to bottle feeding, pacifiers, and artificial nipples-all of which reduced the muscular work necessary for optimal jaw development.
Harvold's experiments on rhesus monkeys demonstrated how mouth breathing dramatically affects jaw development. When monkeys had their nostrils blocked, they developed longer faces with downward sloping mandibles, narrower dental arches, and various forms of malocclusion. These changes reversed when nasal breathing was restored. Modern indoor living creates similar conditions through allergen-rich environments that promote stuffy noses in children.
Critical periods exist for proper jaw development, particularly in the first decade of life, when proper oral posture (closed mouth), nose breathing, and consumption of chewy foods are essential. After this period, correcting development becomes much more difficult.
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The Hidden Dangers of Sleep-Disordered Breathing
Disrupted breathing during sleep can severely impact health, affecting heart function, diabetes risk, stroke likelihood, and mental disorders. Children with obstructive sleep apnea (OSA) frequently experience poor learning skills, behavioral problems, ADHD, brain injury, and depression. Mouth breathing is a primary warning sign of these potential problems.
Poor oral posture typically leads to mouth breathing, a condition requiring prompt treatment in youngsters. A substantial percentage of people in industrialized societies breathe through their mouths-one study in Brazil found 53 percent of children were mouth breathers. The nose serves complex functions: warming, moistening and filtering air, while adding bactericidal nitric oxide before air reaches the lungs. Mouth breathing bypasses these benefits and causes numerous problems beyond just crooked teeth.
Breathing is our primary survival function, continuously monitored by the brain. Sleep disorders that disrupt breathing can trigger severe responses. Obstructive sleep apnea (OSA), affecting an estimated 12 million Americans, typically involves throat blockage-often caused by jaws too small for the tongue, allowing it to fall back and interrupt airflow. As Dr. John Remmers noted, "OSA would not exist if the upper and lower jaws were ideally placed in the face."
Breathing disruption activates the sympathetic nervous system's fight-or-flight response, even during sleep. This raises heart rate and blood pressure while diverting blood from non-essential functions like digestion, reproduction, and growth. This "sympathetic overdrive" can have devastating long-term effects, including cardiovascular disease.
Snoring, another sign of restricted airways, affects roughly 30 percent of people over 30 and 40 percent over 50, with higher prevalence in men. While many consider it normal, snoring was likely rare among our ancestors-it would have dangerously attracted predators to sleeping individuals. The modern changes in jaw development have made snoring increasingly common across all age groups.
Beyond direct impacts, OSA contributes to numerous stress-related diseases including high blood pressure, heart disease, vision problems, chronic lung disease, allergies, cancer, and potentially Alzheimer's disease. Recent research suggests sleep apnea may compromise the blood-brain barrier, potentially contributing to brain damage associated with various neurological conditions.
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Following the Bulldog Trail: A Cautionary Tale
Dentist Mike Gelb presents a fascinating and alarming parallel between bulldogs' breathing problems and human sleep apnea that serves as a stark warning about developmental disorders. Bulldogs suffer from a condition known as "brachycephalic syndrome," characterized by a complex array of facial deformities: severely restricted facial growth, dramatically narrowed nostrils that limit airflow, severely crooked teeth with pronounced crossbite, abnormally elongated soft palates that block airways, and disproportionately large tongues that don't properly fit within their compressed jaw structure. These anatomical challenges mirror those found in humans with similar craniofacial issues, leading to obstructive sleep apnea that becomes increasingly severe when combined with obesity.
This dangerous pattern emerged through decades of selective breeding that prioritized extreme aesthetic characteristics over health considerations - a sobering example of how human cultural preferences can destructively influence canine genetics. The parallel to human development is striking: modern industrialization, with its soft foods and altered breathing patterns, has triggered developmental changes in human facial structure remarkably similar to those artificially selected in bulldogs. The University of Georgia's succession of bulldog mascots provides a particularly stark illustration of this decline: while their 1956 mascot enjoyed a relatively healthy life spanning eight years, their 2011 mascot survived only two years before succumbing to health complications. In both cases, their compromised airways led to cascading failures in their autonomic nervous system and cardiovascular function.
While humans aren't facing immediate extinction from sleep apnea, the condition severely impacts millions of people's quality of life through chronic oxygen deprivation. Progressive bulldog breeders have acknowledged their past mistakes and initiated breeding programs to gradually reverse the breed's harmful characteristics. Though humans cannot directly alter our genetics, we can implement preventive measures, particularly in childhood development. This includes promoting proper chewing habits, encouraging nasal breathing, and maintaining correct oral posture to prevent similar developmental issues.
For adults already suffering from severe OSA cases, maxillomandibular advancement surgery (MMA) represents the only permanent solution, though it remains controversial in medical circles. The procedure, which involves surgically moving both upper and lower jaws forward, carries significant risks including severe post-operative pain, extended recovery periods of up to six weeks, potential infection complications, and is limited by the small number of surgeons qualified to perform it. More commonly performed but less effective is the removal of tonsils and adenoids - a procedure that shows promising results in children but typically delivers only marginal improvements for adult patients.
For those seeking non-surgical intervention, continuous positive airway pressure (CPAP) machines offer significant relief by delivering pressurized air through the nose to maintain open airways during sleep. However, these devices come with their own challenges: they're relatively expensive, require medical prescriptions and ongoing maintenance, and many users struggle with mask discomfort and claustrophobia despite recent advances in mask design and materials. The compliance rate for CPAP therapy remains problematically low, with many patients abandoning treatment within the first year.
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Practical Steps for Prevention and Treatment
The foundation for preventing oral-facial health problems remains George Catlin's 19th-century wisdom: "close your mouth and save your life." Proper oral posture-breathing through the nose with closed mouth, teeth lightly touching, and tongue resting on the palate-is essential for preventing or improving oral-facial health problems.
Extended breastfeeding significantly reduces malocclusion risk, with exclusive breastfeeding recommended for about six months. Weaning should be gradual, introducing solid foods that promote jaw movement while avoiding soft, sweet "baby foods" and processed options. "Baby-led weaning" allows babies to feed themselves from the beginning rather than being spoon-fed, promoting proper jaw development through early chewing of appropriate solid foods.
Proper oral posture requires three elements: closed lips, tongue on the palate, and teeth touching lightly. Parents should teach children to maintain closed mouths when not eating or talking, beginning immediately after birth by gently closing the baby's lips after nursing. Dr. John Mew, orthotropics founder, emphasizes that facial development is highly sensitive to oral habits during childhood.
Parents should monitor children's sleep patterns closely. Chronic morning tiredness likely indicates either too-late bedtimes or early symptoms of sleep-disordered breathing. A chronically stuffy nose in young children demands attention. Nasal congestion can begin within hours of birth and significantly impacts oral posture development.
The Buteyko method trains both children and adults to nose breathe and increase respiratory efficiency. Developed by Soviet physician Konstantin Buteyko around 1950, it defines normal breathing as invisible, inaudible, and with a closed mouth. Three particularly effective Buteyko activities are: sleeping with hypoallergenic tape over the mouth (for older children and adults only), counting steps while holding breath, and unclogging the nose through specific breathing exercises.
The GOPex (Good Oral Posture exercises) program teaches children to adopt the ideal resting position between mouth activities, training the brain to make proper posture the default through repetition. These exercises include meaningful chewing, nasal breathing exercises, and daily practice suggestions like concentrating on nose breathing during exercise.
Although the book focuses on children, older children and adults can still take action, primarily to alleviate sleep-disordered breathing. Airway-centric orthodontics can expand and enlarge dental arches to make more room for the tongue, sometimes substantially reducing symptoms like poor sleep and headaches.
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Transforming Orthodontics and Dental Care
Orthodontics has become routine in industrialized countries, with over half of American children now using braces. Despite improvements in orthodontic technology, the severity of malocclusions is increasing, with more children requiring tooth extractions and jaw surgeries.
Orthodontists, trained as dentists, primarily focus on correcting tooth arrangement through devices like braces that gradually move teeth through bone. Most believe facial features are primarily inherited and that dental crowding is genetic. This "DNA-centric misapprehension" leads them to focus on correcting symptoms rather than addressing underlying causes like inadequate chewing, poor oral posture, and allergen exposure.
Research shows standard orthodontic corrections are often temporary. Studies of over 800 cases concluded that after treatment, tongue space shrinks and malocclusion frequently returns. The authors argue that evolutionary theory and studies of identical twins in different environments demonstrate that genetics plays a much smaller role in malocclusion than orthodontists typically believe.
Forwardontics (also called Biobloc or facial orthotropics) represents a break from traditional orthodontic practices by focusing on the face and causes of malocclusion rather than just teeth alignment. Unlike other methods, forwardontics actively engages patients' jaw muscles rather than doing the work for them. Pioneered by British dentist John Mew in the 1970s, the approach encourages proper oral posture using appliances that are uncomfortable when the mouth is open, thus training patients to maintain proper position.
Mew's groundbreaking study with identical twins aged 8-19 demonstrated that facial growth direction varies with environmental conditions. He treated one twin from each of six pairs using his orthotropic methods while local orthodontists treated the other twin. Ten years later, experts overwhelmingly rated the traditionally treated twins less attractive after treatment, while Mew's patients were more attractive with teeth remaining straight without retainers.
Despite evidence supporting forwardontic approaches, most orthodontists haven't embraced oral posture, diet, and airway considerations. Orthodontists struggle with long-term thinking, failing to recognize that extractions lead to gradual mouth volume shrinkage, potentially causing obstructive sleep apnea-a connection now supported by multiple studies.
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Creating Cultural Change for Better Health
Malocclusion primarily stems from poor oral posture, mouth breathing, modern diets, and indoor living. These problems reflect a broader healthcare approach focused on management rather than prevention, creating enormous economic burdens. Like other environmental challenges, prevention would be infinitely cheaper than treating the consequences.
While braces have become widely accessible over recent decades, forwardontics remains scarce. University clinical programs need to implement serious forwardontic training paralleling current orthodontic education. If forwardontic principles gained acceptance, teachers could support families by incorporating good oral posture exercises into classroom activities, helping shift cultural norms while improving children's reading, speaking and confidence.
Most people in industrialized societies don't recognize the epidemic of facial distortion, sleep apnea, and other oral-facial health problems stemming from modern eating habits and resting mouth posture. Sleep disturbances affect about 30% of preschool children, with negative consequences for development and parent-child relationships.
Human beings learn through imitation and social connection, creating potential for self-propagating waves of postural reform. Today's cyberculture, despite its problems, offers opportunities to spread awareness that "you are how you eat" and "how you rest your mouth." Gaming could be harnessed to improve knowledge about oral-facial health and counteract postural problems associated with device use.
Without concerted action, oral-facial health problems will likely worsen globally. Population growth will add over 2 billion people by 2050, mostly in poor countries, straining food systems already threatened by climate disruption, water depletion, soil erosion, toxic chemicals, and loss of pollinators. As more people urbanize and adopt industrial eating patterns, diseases associated with poor oral-facial health will spread.
Understanding not just what to eat but how we eat, breathe, and rest our mouths is crucial, as these factors shape our children's facial development, sleep quality, longevity, and quality of life. Solving this hidden epidemic requires the same concerted action needed to address other aspects of the human predicament. By returning to some of our ancestral practices-proper chewing, nasal breathing, and correct oral posture-we can potentially reverse this concerning trend and improve health outcomes for generations to come.
