Teeth growth at 15 years old is normal if they are wisdom teeth, but not normal if they are teeth in other positions. Wisdom teeth usually erupt during adolescence, around the age of 18, but there are individual differences, eruption of earlier can be around 15 years of age, which is a normal phenomenon. But if the 15-year-old teeth are other teeth eruption, in general, the oral cavity of the second molar eruption at about 12 years of age, generally according to individual differences may be delayed for 1 to 2 years, but 15 years old teeth eruption shows that the teeth are slow growth, may be a dental malocclusion, or individual nutritional deficiencies affect the speed of tooth eruption. Whether it is normal to grow teeth at the age of 15, you need to go to the hospital to check the position of the erupted teeth, according to the oral and physical conditions, and then judge, specifically consult a professional physician’s opinion.