Tooth loosening refers to the degree of tooth loosening beyond the normal physiological range. In a healthy state, teeth actually have a certain degree of mobility, mainly in the horizontal direction, and the vertical direction is very small, usually no more than 0.02mm, which is usually not easily noticed. When the mobility of teeth is greater than this range due to certain disease factors or other factors, it is called tooth loosening. Many elderly people think that loose teeth is a natural law when people get older and losing teeth is a very normal, in fact, it is not so, as long as the oral health is well maintained, regular checkups to the dentist, regular dental cleaning, teeth for life is not a dream. Loose teeth have a variety of causes, as follows: 1, loose teeth caused by periodontitis should be treated as early as possible, do professional periodontal treatment, which is also the most common cause of clinical encounter loose teeth, if the degree of tooth loosening is serious, the surrounding inflammation is extensive, barely retained may make the inflammation spread to neighboring teeth, resulting in inflammation around the neighboring teeth and cause a series of lesions such as loose teeth, so the extraction of excessive loose teeth 2, due to occlusal problems caused by loose teeth, mainly by the oral surgeon’s judgment to adjust the occlusal problems; 3, trauma caused by loose teeth must not be delayed, the earlier the effect of treatment, the better; 4, if caused by periapical inflammation of loose teeth, should first solve the periapical inflammation, by the oral surgeon through root canal treatment or other treatment, with the periapical inflammation of 5. Loose teeth are normal when the baby teeth are replaced and do not need any treatment, but if the permanent teeth have erupted and the baby teeth are delayed, it may cause abnormal position of permanent teeth, and the corresponding baby teeth should be extracted early to promote the eruption of permanent teeth. Therefore, the prevention of loose teeth is mainly for the related etiology, maintaining oral hygiene, regular oral examination and oral cleaning, which are important measures to prevent oral diseases.