The vertical stripe in the middle of the tongue refers to a ligature-like thing called the lingual tether in the middle of the tongue’s abdomen, where the tongue body meets the lower jaw. The lingual ligament itself is a ligament that connects the floor of the mouth to the belly of the tongue. If the lingual ligament is too short, it may affect some pronunciations. There are many children who are treated clinically for short tongue ligaments and the recommended time for tongue ligament surgery is around 3-4 years old. However, there are some controversies in this case, some people think that it is relatively early to lengthen the tongue tie after birth, so it is recommended to lengthen the tongue tie at the age of 3-4 years.