Prehistoric humans never had toothbrushes or toothpaste, but they weren’t helpless against tooth decay. They used a combination of woody chew sticks, pointed tools for picking between teeth, and fibrous plants to keep their mouths reasonably clean. Their biggest advantage, though, was diet: without sugar and processed starches, their teeth simply didn’t face the same threats ours do.
Toothpicking: The Oldest Known Dental Habit
The earliest evidence of deliberate tooth cleaning comes from toothpick grooves, tiny wear marks left on fossil teeth by repeated scraping between them with a hard, thin object. These grooves have been found on teeth from early human ancestors dating back roughly 1.8 million years at Olduvai Gorge in Tanzania. The tools were likely made from bone splinters, small sticks, or stiff grass stalks. The marks are distinctive enough that researchers can differentiate them from normal chewing wear, and they show up on multiple fossil specimens from different sites in East Africa.
This makes toothpicking not just old, but arguably the oldest documented personal hygiene habit in human history. Neanderthals did it too. Fossil teeth from Neanderthal sites show clear signs of non-dietary wear, meaning the teeth were being used for activities beyond eating, including cleaning.
Chew Sticks and Fibrous Plants
Before the toothbrush was invented, people across many cultures cleaned their teeth by chewing on sticks from specific trees. The most well-documented is the miswak, a chew stick made from the Salvadora persica tree, which has been used for thousands of years across Africa, the Middle East, and South Asia. You fray one end of the stick by chewing it until the fibers separate into something like a small brush, then use it to scrub your teeth. Clinical studies have confirmed that this method effectively removes plaque.
Prehistoric people almost certainly did something similar with whatever woody plants were available. Analysis of Neanderthal dental calculus (the hardite buildup on teeth that preserves tiny particles like a time capsule) from the El Sidrón site in Spain found embedded wood fibers from conifer trees. These weren’t from eating. The fibers came from the woody part of the tree, not any edible portion, and researchers concluded they were remnants of oral cleaning or tool use involving the teeth. The same calculus samples contained plant fibers, mineral grit, and traces of non-nutritional plants that appear to have been used medicinally.
Diet Did Most of the Heavy Lifting
The single biggest reason cavemen’s teeth survived without modern dentistry was what they ate. Tooth decay is primarily driven by bacteria that feed on sugars and starches, producing acid that eats through enamel. Hunter-gatherers ate meat, fibrous vegetables, nuts, and wild fruits, none of which cling to teeth the way bread, porridge, or candy do.
The difference becomes strikingly clear in the archaeological record. Studies comparing Neolithic populations show that hunter-gatherers had cavities in about 3.4% of their teeth, while millet-farming communities had decay in 14% of teeth. That’s a fourfold increase tied directly to the shift toward starchy grain-based diets. The transition to agriculture, roughly 10,000 years ago, is widely considered the turning point when human dental health took a nosedive.
Fibrous, tough foods also provided a kind of passive cleaning. Chewing raw meat, roots, and fibrous plants creates friction that scrubs tooth surfaces and stimulates the gums, similar to how crunchy vegetables can help clean your teeth today, just on a much more intensive scale. Hunter-gatherer teeth show heavy wear from this abrasive diet, but relatively little decay.
Evidence From Modern Hunter-Gatherers
Studying the Hadza people of Tanzania, one of the last remaining hunter-gatherer groups, offers a window into what prehistoric oral health may have looked like. Researchers from the University of Arkansas found that all Hadza foragers showed some degree of cavities, gum disease, and tooth wear, so the idea that a natural diet guarantees perfect teeth is a myth. But the patterns were revealing. Women living on wild diets in the bush had the best oral health in the study, while men on wild diets who consumed large amounts of honey and smoked more had the worst. In villages where people ate agricultural diets, the pattern reversed: men had healthier teeth and women had worse outcomes.
The takeaway is that diet matters enormously, but it’s not the whole story. Honey, a natural sugar, still feeds decay-causing bacteria. Smoking dries out the mouth and promotes gum disease. Even without processed food, lifestyle factors shaped dental health in complex ways.
The Earliest Attempts at Dentistry
When prevention failed, some prehistoric people took surprisingly active steps to deal with dental problems. The oldest known dental intervention is a 14,000-year-old tooth from Villabruna in northern Italy that shows signs of having been scraped out, likely to remove decayed material from a cavity. Even more remarkable, a 13,000-year-old skeleton found at Riparo Fredian, also in northern Italy, had two front teeth with large cavities that had been deliberately scraped clean with a hand-held tool and then filled with bitumen, a naturally occurring tar-like substance. Researchers believe the bitumen may have served as both a protective seal and a crude antiseptic.
These are Ice Age dental fillings, predating the previously known earliest fillings (from Slovenia, around 6,500 years old) by thousands of years. The horizontal scratch marks inside the cavities are consistent with a scraping and twisting motion, suggesting a careful, intentional procedure rather than accidental damage.
Why Their Teeth Still Wore Down
Despite lower rates of decay, prehistoric teeth faced a different problem: extreme mechanical wear. Grit from stone-ground food, sand in foraged plants, and the sheer toughness of an unprocessed diet ground teeth down over a lifetime. Many ancient skulls show teeth worn nearly flat. This wear could expose the inner layers of the tooth and eventually cause abscesses and infection, which, without antibiotics, could be life-threatening. Dental abscesses are a documented cause of death in prehistoric remains.
So while cavemen avoided the cavity epidemic that came with agriculture, they traded it for a different set of problems. Their teeth were cleaner than you might expect, maintained through simple mechanical tools and a low-sugar diet, but the absence of modern dentistry still meant that a bad tooth could become a serious, even fatal, health crisis.