The so-called residual roots are the remaining roots of the teeth after the crowns are destroyed. This part of the root because of the loss of the normal bite, so in the daily chewing activities can not play a role in the anterior area will affect the aesthetic, and sometimes even pain, inflammation, affecting oral health and their quality of life. Therefore, some people feel that the residual root is useless and should be removed as soon as possible so as not to create a big problem in the future; others think that “the body hair and skin, the parents”, should be retained as much as possible, usually it does not hurt and does not itch, keep it and does not bother, why should it be removed? Do I need to remove the root or not? If the root is intact and the root length is sufficient, the root can be used to make a pile crown restoration, which can also function normally. In anterior teeth, porcelain crowns can be placed for aesthetic improvement. In cases of multiple missing teeth requiring fixed restoration, the residual root can also be used as the abutment of the fixed bridge. If the root is too short, the movable denture can be covered with the mucosa and the residual root, which is the overdenture. Of course, the residual roots in all the above cases must undergo perfect root canal treatment, so as to ensure the safety and reliability of the use of the roots as well as the durability and stability of the restorative effect. For those roots that are too short, fractured or no longer supported by alveolar bone, they should not be preserved and are recommended to be extracted; while those roots that are excessively decayed, painful or inflamed at the root tip need further treatment and can only be considered for restoration after their efficacy has been determined. For those residual roots that are temporarily asymptomatic but cannot be treated perfectly, they can be observed first or be restored simply, and once the problem occurs, they should be extracted immediately to avoid the spread of inflammation affecting the safety of adjacent teeth and alveolar bone. In conclusion, the retention or not of residual roots cannot be generalized, but needs to be determined with the clinical reality and the patient’s own situation. As long as the treatment is timely and proper, and fully utilized, the small residual roots will play a “residual” role and bring you a healthy and happy life.