The whole tooth can really improve the face shape to some extent. For example, some people will have a protruding mouth, one is because their chin is retracted, and the other is because their teeth have problems. Some people bite because their lower teeth protrude forward, which will cause the problem of chin protruding forward. Children's habit of sleeping with their mouths open for a long time will lead to problems such as occlusion of teeth and unsightly lips.