An underbite is when your lower jaw protrudes beyond your upper jaw, and lower teeth sit in front of the upper teeth.
The opposite of an overjet, underbites are primarily due to genetics and sometimes caused by childhood habits.
If you don’t fix it
Underbites can make some people feel self-conscious about their smile. Left untreated if can sometimes lead to rapid tooth wear on your molars, Temporomandibular Joint Dysfunction (TMJ syndrome) problems and jaw pain.
How to correct
Because an underbite is a jaw alignment problem, not just a teeth alignment problem, your orthodontist may want to first correct the jaw alignment, using a Motion 3D appliance or another method, before finishing your treatment with Reveal® Clear Aligners.