What is the mouthpiece called that dentist fit your mouth for to make bite less shallow Its like a piece BUT look teeth and you wear it 6 mos or till adjust?

An occlusal splint, also known as a bite plane or bite guard, is a custom-made dental appliance that is used to correct a misaligned bite. It is typically worn over the upper or lower teeth and helps to reposition the jaw to improve the bite. Occlusal splints are often used to treat conditions such as temporomandibular joint disorder (TMD) and bruxism (teeth grinding).

Occlusal splints are typically made of a hard acrylic material and are designed to fit snugly over the teeth. They are usually worn for a period of 6-12 months, or until the desired results are achieved. In some cases, a person may need to wear an occlusal splint for a longer period of time.