First, some gum smiles are caused by the long gums of the upper teeth, so the long gums should be removed;
Secondly, because the levator labialis and levator labialis are too developed, the upper lip is involved too much, resulting in gum exposure. We can correct gingival smile by surgically removing part of levator labialis or levator labialis.
Third, a relatively simple method is to inject a little botulinum toxin to paralyze levator labia and levator alar muscles, thus correcting gingival smile;
Fourthly, some buck teeth are caused by the overgrowth of maxilla, which needs maxillary osteotomy and orthopedic surgery to correct.
Therefore, gingival smile should be corrected in different ways according to specific reasons, and it cannot be generalized.