Wisdom teeth are known as third molars that erupt between the ages of 18 to 25.
According to some scientific theory earlier humans ate much different diet than today. Our ancestors lived off a diet that includes raw meat, roots; tough plants etc. for that kind of food they need a third set of molars and larger jaw to accommodate those third molars.
Now a day, humans are eating soft, cooked, boiled foods. So now there is no need of extra molars and jaw size is also decreased. There is no space available to accommodate third molars but still our genes produce wisdom teeth.
When wisdom teeth don’t have enough space to erupt through gum line then they sleep within the jaw bone or they erupt in a different angulation then we call it as impacted teeth.
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