Class 3 malocclusion, called prognathism or underbite, occurs when the lower jaw protrudes or juts forward, causing the lower jaw and teeth to overlap the upper jaw and teeth. If you don’t correct your malocclusion, you may experience yet another problem tooth decay. When your teeth don’t fit together properly, it can be harder to maintain good oral hygiene. It can also damage your tooth enamel or cause problems with your jaw And in some cases can change the shape of your face. #styleyoursmile W