An Overbite occurs when the top front teeth overlap the bottom front teeth. If they overlap significantly, it is also called a Deep Bite. If the top teeth protrude significantly and are slanted forward away from your bottom front teeth, it is called an Overjet.
An Overbite can cause difficulty in eating, speaking, and breathing properly, teeth grinding, headaches, and TMJD. It is usually fixed with a combination of braces and appliances. In severe cases, you may need to get teeth extracted or get jaw surgery.
It is normal to have a small amount of Overbite. But if the Overbite is more than a few millimeters, it may be cause for concern.