Hello, this is what we call the land wrapped in heaven. When normal people bite, the maxillary teeth also cover the mandibular teeth to some extent. Natural protection refers to the phenomenon that the teeth of the upper jaw always cover the teeth of the lower jaw seriously, and the chin is sunken. Tianbaodi can be corrected by orthosis or surgical orthodontics. The most commonly used orthoses are fixed orthoses, movable orthoses and some lingual orthoses. It should be noted that bad habits can also lead to many things, such as biting your lips. If you have the habit of biting your lips, I suggest you correct it from an early age. I hope my suggestion is helpful to you. If you want to gain more authoritative knowledge of medical beauty, you need lemon to love beauty.