According to Gram Research analysis, people with more healthy, working teeth eat significantly better diets than those with missing or damaged teeth. A 2026 study of 6,291 Americans found that each additional functional tooth was linked to higher diet quality scores and lower consumption of inflammation-promoting foods, with untreated cavities and gum disease showing the strongest associations with poor eating patterns.
A major study of over 6,000 Americans found that people with more healthy, functional teeth eat significantly better diets than those with missing or damaged teeth. Researchers discovered that each additional working tooth was linked to better overall diet quality and less inflammation-promoting foods. The study also showed that untreated cavities and gum disease were connected to poorer eating habits. While other factors like income and education matter too, this research suggests that dental health is an important but often-overlooked piece of the nutrition puzzle.
Key Statistics
A 2026 cross-sectional study of 6,291 U.S. adults found that each additional functional tooth unit was associated with a 0.41-point increase in Healthy Eating Index scores and a 0.06-point decrease in the Dietary Inflammation Index, indicating better overall diet quality.
According to research reviewed by Gram, adults with untreated cavities showed less favorable dietary profiles compared to those without cavities, even after adjusting for the total number of functional teeth they possessed.
A national analysis of 6,291 Americans revealed that people with adequate functional teeth had measurably higher dietary quality than those with impaired teeth or no teeth, with each additional working tooth associated with consumption of more diverse food items.
The 2026 study found that coexisting cavities and gum disease were associated with the least favorable dietary quality patterns among all dental conditions examined in the 6,291-person sample.
The Quick Take
- What they studied: Whether the number and health of your teeth affects what kinds of foods you eat and how nutritious your diet is
- Who participated: 6,291 American adults from a national health survey conducted between 2011 and 2014, representing different ages, incomes, and backgrounds
- Key finding: People with more working teeth ate healthier diets with better nutrient balance, while those with missing or damaged teeth tended to eat less nutritious foods. Each additional functional tooth was linked to measurably better diet quality scores.
- What it means for you: Taking care of your teeth isn’t just about your smile—it directly affects what you can eat and how well you’re nourished. If you have dental problems, you may need extra help making sure you’re getting good nutrition.
The Research Details
Researchers used information from a large national health survey that tracked what Americans eat and assessed their dental health. They looked at 6,291 adults and measured two main things: how many teeth each person had that actually worked for chewing, and whether they had cavities or gum disease. They also collected detailed information about everything each person ate over two days, then scored their diets using three different nutrition rating systems to see how healthy their eating patterns were.
The researchers compared people with different numbers of working teeth and different types of dental problems to see if there were patterns in their eating habits. They used statistical methods to account for other factors that might affect diet, like age, income, and education, so they could isolate the effect of dental health specifically.
This approach is important because it looks at real-world data from actual Americans rather than a controlled experiment. It shows how dental health connects to nutrition in everyday life, which helps doctors and dentists understand that oral health isn’t separate from overall health. By measuring multiple aspects of diet quality rather than just one thing, the researchers got a complete picture of how teeth affect eating.
This study used nationally representative data, meaning the results should apply to the general US population. The researchers carefully adjusted their analysis to account for other factors that influence diet. However, because this is observational data, we can see that dental health and diet quality are connected, but we can’t prove that bad teeth directly cause poor eating—it could work both ways or be influenced by other factors.
What the Results Show
Adults with adequate functional teeth had noticeably better diet quality scores compared to those with missing or damaged teeth. The study found that each additional working tooth was associated with a meaningful improvement in diet quality scores and a reduction in foods that promote inflammation in the body.
When researchers looked specifically at people who still had teeth, those with untreated cavities had worse dietary patterns than those without cavities, even after accounting for how many teeth they had. People with both cavities and gum disease had the least favorable eating patterns of all.
Interestingly, the type of dental problem mattered. People with only untreated cavities showed different dietary patterns than those with filled cavities or gum disease, suggesting that the presence of active dental disease affects food choices differently than past dental problems.
The study found that people with more working teeth reported eating a wider variety of foods overall. Dental conditions were significantly linked to differences in what people ate and the nutrients they consumed. However, when the researchers looked at the big picture, sociodemographic factors like income and education explained more of the overall differences in diet quality than dental health alone did.
This research builds on earlier studies showing that tooth loss affects nutrition by providing a more detailed picture. Previous research focused mainly on how many teeth people had, but this study also examined active dental disease like cavities and gum problems. The finding that active dental disease matters separately from tooth loss is relatively new and suggests that dental treatment might help improve eating habits.
Because this study observed people at one point in time rather than following them over years, we can’t be certain whether bad teeth cause poor eating or if poor eating habits lead to bad teeth. The study relied on people remembering what they ate, which isn’t always perfectly accurate. Additionally, the researchers couldn’t measure all possible factors that might affect both dental health and diet, so some of the connection might be explained by unmeasured factors.
The Bottom Line
If you have dental problems, prioritize getting them treated—not just for your teeth, but because it may help you eat better. Work with your dentist to address cavities and gum disease. If you have missing teeth, discuss options like dentures or implants that can help you chew a wider variety of nutritious foods. If dental work is difficult to access, consider softer nutritious foods like eggs, yogurt, beans, and cooked vegetables. (Moderate confidence: based on observational data showing association, not proven causation)
Everyone should care about this, but especially older adults, people with limited access to dental care, and those with existing dental problems. If you’ve noticed that dental problems make it hard to eat certain foods, this research validates that concern and suggests it’s worth addressing.
If you get dental treatment, you may notice you can eat different foods immediately, but it may take weeks to months to establish new eating habits and see improvements in overall diet quality and health markers.
Frequently Asked Questions
Does having bad teeth make you eat unhealthy foods?
Research shows a strong connection: people with more working teeth eat higher-quality diets with better nutrition. A 2026 study of 6,291 Americans found that untreated cavities and gum disease were linked to poorer eating patterns, though the exact cause-and-effect relationship isn’t completely clear.
Can fixing my teeth help me eat better?
Potentially yes. When you can chew comfortably, you can eat a wider variety of nutritious foods like raw vegetables, nuts, and whole grains. The study suggests dental treatment may help improve diet quality, though long-term benefits depend on making healthy food choices.
What foods can I eat if I have dental problems?
Soft, nutritious options include eggs, yogurt, beans, cooked vegetables, fish, oatmeal, and smoothies. These provide good nutrition without requiring extensive chewing. As dental health improves, gradually add back harder foods like raw vegetables and whole grains.
Is dental health really that important for nutrition?
Yes, according to this research. While other factors like income and education matter more overall, dental health directly affects what foods you can eat and your ability to get proper nutrition. Untreated dental disease showed distinct links to poor diet quality.
Should I get my cavities filled to improve my diet?
Yes, treating cavities is worthwhile for multiple reasons. Beyond preventing tooth loss, this research suggests that active dental disease affects eating habits. Treating cavities may help you comfortably eat more nutritious, varied foods that support better health.
Want to Apply This Research?
- Track the variety of food groups you eat daily (vegetables, fruits, whole grains, proteins, dairy) and note any correlation with dental discomfort or recent dental work. Aim to increase variety as dental health improves.
- Set a reminder to eat one additional food group per day that requires chewing, and log which foods you can comfortably eat. After dental treatment, gradually expand this list and track improvements in meal variety.
- Weekly check-ins on food variety and chewing comfort, with monthly reviews of overall diet quality scores. If dental problems return, note any changes in food choices or nutrition patterns to discuss with your dentist.
This research shows associations between dental health and diet quality but does not prove that dental problems directly cause poor eating habits. Individual results vary based on many factors. Consult with your dentist about dental treatment options and with a registered dietitian about nutrition strategies suited to your specific dental situation. This article is for educational purposes and should not replace professional medical or dental advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.