Are Our Teeth Worse Than Our Ancestors? - By: Sehej Obhan

Most mornings, chances are your teeth get first-class treatment: two minutes with a toothbrush, maybe a quick floss, and a minty rinse to finish things off. For many people, that routine goes even further: whitening strips, aligners, electric toothbrushes, and “advanced” toothpastes promising brighter, straighter, and healthier smiles. It’s clear that we’ve built an entire industry around achieving what we consider “perfect” teeth.

But here’s the surprising twist: when researchers examine ancient human teeth, they often find less tooth decay than we see in modern populations. Not straighter teeth. Not whiter teeth. But fewer cavities.

This raises an interesting question. If we have more dental knowledge, more technology, and more access to professional care than any generation before us, why do our mouths seem to struggle so much just to stay healthy? What changed between then and now?

The biggest shift is our diet.

Diet plays a central role in modern oral health problems. Today’s diets are filled with added sugars and highly processed carbohydrates, think white bread, sugary snacks, and soda. These foods fuel cavity-causing bacteria and create acidic conditions that weaken enamel. On top of that, we snack far more frequently than our ancestors ever did, meaning our teeth are exposed to acid attacks throughout the day with little time to recover.

Modern food is also much softer and more processed. In contrast, our ancestors’ diets were tougher and more fibrous, providing natural “scrubbing” that helped clean teeth during chewing. Their meals consisted largely of lean meats, nuts, roots, and vegetables, with very little refined sugar or flour. This likely supported a healthier oral microbiome, leading to fewer cavities and less gum disease overall.

Researchers have also observed clear turning points in dental health throughout human history. When populations shifted from hunting and gathering to farming, and later to industrial food processing—rates of tooth decay increased dramatically. Diets became heavier in carbohydrates, altering the balance of bacteria in the mouth and allowing harmful species to thrive. At the same time, softer diets reduced the need for heavy chewing, contributing to smaller jaws. This change has been linked to crowded teeth, impacted wisdom teeth, and areas that are harder to clean effectively.

Of course, ancient teeth were far from perfect. While cavities may have been less common, people faced other serious dental problems. Gritty foods caused significant tooth wear, and gum disease or infections often went untreated. A toothache could become life-threatening in a world without antibiotics, anesthesia, or professional dental care.

So what’s the takeaway? Modern life has made cavities more common, but it has also given us major advantages. Fluoride toothpaste, improved oral hygiene, regular dental care, and a better understanding of prevention mean that our teeth can last longer and stay healthier than ever before. By being mindful of our diets and maintaining good daily habits, we can combine the best of modern dentistry with lessons learned from our ancestors.