A convex dental mouth can be improved with metal braces, ceramic braces, and invisible braces. In the case of a bony convexity, it cannot be improved by wearing braces.
There are many reasons for a convex mouth, and currently there are two main types of convex mouths: dental and bony. If it is caused by misalignment of teeth, braces can be worn to improve the situation, often using metal braces, ceramic braces, or invisible braces if you feel that it affects the aesthetics.
For people with bony convexity, braces will not improve the convexity of the mouth, and orthognathic surgery is needed to correct the convexity of the mouth.
If you want to correct your convexity, you should choose according to your personal situation, not everyone can wear braces.