How can a mall mouth and overbite be fixed?

Orthodontics: You should have your dentist refer you to a orthodontist to evaluate your bite and give recommendations on what can be done to correct your malocclusion. Depending on your age and medical history the orthodontist can give you the best options available.The benefits will be huge long term for you.

Braces: I assume the question is small mouth and overbite? This really is a subjective question because it depends on your age. If you are an adult then some expansion options are limited (not impossible but limited). We also can't manipulate growth as we do with kids. So we are limited to what we call camoflauge treatment. Best to consult with an orthodontist to get all the options.

Overbite: In layman's terms, an "overbite" typically refers to the upper front teeth sticking out horizontally, further than the lower front teeth. An orthodontist defines an "overbite" as the vertical overlap of the upper front teeth over the lower front teeth. They are very different situations unfortunately with the same name. It's best to have an exam with an orthodontist to determine the problem.