Wisdom tooth removal has become somewhat of a rite of passage – puffy-cheeked post-extraction photos, a diet of Jell-O and mashed potatoes. But not everyone gets their wisdom teeth taken out. In fact, not everyone has wisdom teeth at all! Have you ever wondered why some people have four wisdom teeth while others have fewer or even none? We’ve got the facts behind how many wisdom teeth people have and why!
Why do we have wisdom teeth?Third molars, or wisdom teeth, were once very useful to our ancestors. Because prehistoric man’s diet of hard-to-chew plants and uncooked meat required powerful chewing muscles, our ancestors’ jaws were large enough to fit 32 teeth, not just 28. Now that humans have evolved a better means of chewing and digesting our food, we no longer have large jaws, so we simply have no need or no room for wisdom teeth. Many scientists believe humans are currently evolving third molar hypodontia, or the lack of wisdom teeth, due to their inability to develop in the first place.
How many people have wisdom teeth?About 20-25% of the human population is born with 1 to 3 wisdom teeth, and 35% is born without any wisdom teeth at all.
Why do some people have wisdom teeth and some don’t?There are a few reasons why scientists believe that not everyone develops wisdom teeth:
- Genetics: Some evidence suggests that a genetic mutation occurred hundreds of thousands of years ago, causing some people to be born without wisdom teeth.
- Environment: Percentages of people who develop wisdom teeth varies from culture to culture. Certain ethnic groups are known for low percentages of wisdom teeth development, while others are known for high percentages. Environmental factors during dental development are also a possible explanation.