14 year old boy tooth replacement is also within the normal range, the general child in 12 ~ 13 years old around milk teeth can be replaced, if the milk teeth eruption is too late, the replacement of permanent teeth will also be relatively late. 14-year-old boy’s milk teeth have not fallen off, we must let the child eat more hard food, on the one hand, promote the root absorption of milk teeth, so that the normal eruption of permanent teeth; on the other hand, you can also promote the development of the jawbone, to avoid the later because of insufficient development of the alveolar bone to make the teeth crowded, so as to avoid the teeth of the jaw deformity, and so on. Parents should pay attention to let the child to avoid licking lips and biting lips and other bad habits, drink more boiled water during the tooth replacement, eat less sweets, to avoid tooth decay and so on. 14-year-old boys change teeth, should be timely to the hospital, according to the situation of active treatment, so as not to delay the condition.