An underbite is when you close your mouth and your lower front teeth are in front of your upper teeth. In many cases, this is actually a problem with the lower jaw too far forward.
An underbite can make it difficult to chew properly and speak clearly, and it can cause your teeth to wear out more quickly.
Clearfy clear aligners can fix some underbites. More complex underbites may require surgery prior to treatment with Clearfy.