What is the best way to treat underbite for a 19 year old? will surgery be a risky task?

Jaw distraction is a possible solution, the jaw is put in a brace for up to six weeks to improve the mandible placement, but may take multiple procedures to get the desired effect -discuss or consult with your orthodontist for more information

Best thing to do is to go to an orthodontist

Treatment of underbite depends on which jaw, or both, is at fault. Please see a specialist Orthodontist for an initial examination. The Orthodontist will be able to give you individualized information and refer you to an Oral and Maxillo-facial Surgeon if indicated. There is risk in all treatment, and these practitioners can discuss alternatives and risk/reward with you.