Gum recession, in general, can be divided into two types, one is physiological gum recession and the other is pathological gum recession. Physiological gum recession refers to a slight tendency of the gums themselves to recede as a person ages, which simply means that the gums of older people will recede a little bit more than those of younger people. This is very slight and does not affect the looseness of the teeth. There is no need to treat this condition. However, there is also pathological gum recession, which in most cases is due to periodontitis, and once periodontitis is detected, it is important to intervene as soon as possible. If not intervened, it may cause a series of problems, including gum recession, including the resorption of the alveolar bone, and eventually the teeth will become loose and fall out without support. After the teeth are loosened and lost, the patient’s entire facial shape, chewing function and pronunciation will be affected. Therefore, once pathological gum recession occurs, patients are advised to seek medical attention as soon as possible.