Can Teeth Grow After 18?

No, teeth don't grow back and at 18 years of age it's a permanent tooth

permanent tooth

Permanent teeth or adult teeth are the second set of teeth formed in diphyodont mammals.

› wiki › Permanent_teeth

so a new one will not come out.

Does teeth grow after 20?

First, a set of 20 baby teeth erupts and falls out. Then 32 permanent teeth grow in. The first set of molars usually becomes visible at age 6, the second set around 12, and the final set (wisdom teeth) sometime before age 21.

Which age teeth stop growing?

The average child has their full set of 20 primary teeth by the age of 3 years. Between the ages of about 6 and 7 years, the primary teeth start to shed and the permanent teeth begin to come through. By the age of about 21 years, the average person has 32 permanent teeth – 16 in the upper jaw and 16 in the lower jaw.