Dental edge defect usually refers to the gradual wear of the incisal edge of the anterior occlusion, i.e., the occlusal plane of the upper and lower teeth. This problem is relatively complicated because the wear of the incisal edge is divided into various situations, as follows: 1. Mechanical wear: Some patients have bad chewing habits, such as liking to eat hard food, or some patients like to bite pen sticks. Individual patients are occupational, usually need to bite some items, such as playing musical instruments, wind instruments may appear local wear and tear, known as mechanical wear; 2, chemical wear: some patients may belong to chemical wear due to physical reasons, such as some patients have poor gastrointestinal function, often have the habit of vomiting, or some patients have poor dietary habits, like to eat too acidic food, such as The intake of large amounts of acid causes demineralization of the surface of the teeth and the intolerance of friction, which gradually wears away. Wear, whether mechanical or chemical, can have an impact on pronunciation and aesthetics, and some patients are even prone to wear on their back teeth. In most cases, the facial shape changes after wear, the vertical height of the lower third of the face becomes lower and lower, and the face appears older. Therefore, for marginal defects, it is recommended to first seek a professional doctor to diagnose the cause. Secondly, according to the cause, we should first correct our bad habits, such as changing the habit of eating hard food and avoiding too much acidic food, and try to overcome vomiting, or we can take medication to control it. For the treatment, the choice of elevating the vertical distance for the restoration or using other appropriate means requires professional guidance from the doctor.