Generally teeth stop growing after the age of 17, but thereafter, even after adulthood, wisdom teeth may erupt, which cannot be generalized and there will be individual differences. Teeth are the hardest organs in the body and are categorized into incisors, cuspids, premolars and molars. Teeth erupt twice in a person’s life, the first being milk teeth, which begin to erupt six months after birth, and generally grow all the way up to about three years of age, with a total of 20 teeth. At the age of 6~7 years old, they start to fall out, and the teeth that erupt after that are called permanent teeth, totaling 32 generally around 12 years old, all of the milk teeth are replaced with permanent teeth, but in adulthood there is still the possibility of wisdom teeth eruption, all of which are normal. So when the permanent teeth fall out will not grow new teeth, so you have to protect the teeth, pay attention to oral hygiene. Calcium is the main component of teeth, so it is important to take reasonable calcium supplements during tooth replacement in order to make the teeth stronger.