The root of the milk tooth has come out from the gums, considering that it may be caused by the stagnation of milk tooth, apical periodontitis of milk tooth, gum recession of milk tooth, etc., and need to be treated by extraction of milk tooth, root canal treatment, removal of irritating factors, etc. 1. Extraction of milk teeth: If the roots of milk teeth are exposed outside the gums due to the extrusion of the permanent tooth embryo during development, the milk teeth and their roots need to be extracted in time after examination at the stomatology department of the hospital. 2. Root canal treatment: the exposure of the roots of the milk teeth may also be considered to be the pulp cavity of the milk teeth infected periapical tissues damaged by inflammatory substances, resulting in periapical bone resorption, and make the gums recede, thus appearing the phenomenon of the exposure of the roots of the milk teeth, it is recommended that the best to go to the hospital to carry out the root canal treatment of milk teeth, for the young milk molar teeth root canal treatment and then fillings and other work. 3. Remove the stimulating factors: If the oral hygiene is poor, often food blockage or plaque and other stimulating factors, it is easy to lead to the gum recession of the milk teeth, so that the roots located in the deep part of the gums are exposed, it is recommended that the best to go to the hospital to carry out scaling or gingival scouring to remove the calculus or plaque and other stimulating factors. It is recommended that patients pay attention to oral hygiene in daily life and seek medical examination and treatment in time when problems arise.