An open bite results when the upper and lower incisor teeth do not touch when biting down. This open space between the upper and lower front teeth causes all the chewing pressure to be placed on the back molar teeth. This excessive biting pressure and rubbing together of the back teeth makes chewing less efficient and may contribute to significant back tooth wear, as well as headaches, TMJ, and gastrointestinal upsets. It also contributes to messy eating habits and speech impediments.
These patients have an unattractive smile because the front teeth are pushed up too high behind the upper lip, giving the false impression that the upper front teeth are missing or that less than half of the vertical crown heights of the front teeth show when they smile.