Untreated underbite can affect everything from self esteem to.
This condition, malocclusion, can lead to a host of serious dental and jaw-related problems.
Your treatment options will depend on how severe your underbite is.
There are lesser cases though where minor surgery can fix it.
Another reason one might develop either an over- or underbite is if they used a pacifier or frequently sucked their thumb when they were a small child and their adult teeth were growing in.
People tend to find these severe underbites repulsive.