At what age do teeth stop growing?

Generally, our teeth stop growing around the age of 12. Humans have a diphyodont dentition, meaning they develop teeth twice in their lifetime: the first set is the primary (deciduous) dentition, and the second is the permanent dentition. Under normal circumstances, the number of teeth in people's mouths varies. Children have 20 primary teeth, while adults typically have at least 28 permanent teeth. In addition to the 20 primary teeth, each of which has a corresponding permanent tooth to replace it, eight additional molars emerge behind the primary teeth between the ages of 6 and 12—two on each side of both upper and lower jaws. These are all permanent teeth and will not be replaced later. Around the age of 20, an additional large tooth may erupt behind these permanent molars, known as the "wisdom tooth" or third molar. Therefore, adults usually have between 28 and 32 permanent teeth. Additionally, some individuals may be congenitally missing one or two permanent teeth, so the total number of teeth in people's mouths often differs. Generally, after the permanent teeth finish erupting around age 12, most people do not grow any more teeth.