It is a very common clinical situation that babies are almost 7 months old and still not teething,1 and there is no need for parents to worry about it. Generally we say that children start erupting their first teeth around 6 months to 8 months. However, some children develop early and erupt early. Some children develop later and erupt later, and this is normal. As long as the developing tooth is of normal texture and position, and is not obviously loose, we consider this tooth to be our normal erupting tooth. The clinical definition of late eruption is that the teeth are still not erupted within 1 year after birth, then we will consider it as late eruption. There is no good treatment for late eruption, which means that the eruption of teeth is congenital, and most of the teeth are normal regardless of whether they erupt early or late. Even in the more severe cases of late eruption, the majority of cases are congenital and there is no way to intervene, and in many cases there is no treatment.