Mouths do not usually get bigger without plastic surgery; mouth size is closely related to genetics and does not usually get bigger after maturity.
The mouth is one of the most important organs of the human face, and the size of the mouth may affect the overall aesthetics. Currently, medical cosmetic surgery can change the fullness and size of the mouth through hyaluronic acid injections, fat tamponade and other procedures.
Without external intervention, the size of the human mouth is usually related to genetic factors, i.e. congenital formation, and has little to do with acquired behavior. After a person grows and develops completely, usually the mouth size will not become bigger or smaller, it is recommended not to worry too much about one’s own appearance, keep a good mindset, and the mouth will not grow bigger and bigger in general.