Teeth that are too long and worn short and then very sour belong to dentin hypersensitivity, it is recommended that desensitization treatment, and in severe cases, crown restoration can be carried out. Teeth too long grinding short will lead to exposure of dentin tubules, serious cases lead to exposure of dentin, soreness and discomfort symptoms, mechanical stimulation or hot and cold aggravated, can be desensitization treatment, closed sensitive dentin tubules; if the effect is not obvious or too much exposure of dentin, crowns can be restored. Under normal circumstances, the upper and lower teeth contact, oral teeth have a stable occlusal relationship, when a tooth is missing, if not repaired in a timely manner, its opposing teeth is elongated, neighboring teeth tilt, affecting the later restorative treatment, this time the need to elongate the teeth grinding, so it is recommended to repair the missing teeth as soon as possible, do not be negligent, so as to avoid delays in the condition.