Black spots on the roots of teeth can be treated separately according to the specific situation. If the gum is receding and the exposed root surface is forming caries, low-speed ball drill can be used to slowly remove the decayed tooth tissue and then fill it with composite resin to avoid the formation of overhanging and irritated gum tissue. If there is a large amount of calculus and exogenous pigments such as tea stains, tobacco stains, coffee stains, etc. attached to the cervical part of the teeth, ultrasonic scaling can be used to remove the supragingival calculus and manually scrape the subgingival calculus, and then sandblasting can be used to remove the pigments. When available, polishing can be done with silicone abrasive tips to avoid re-formation of melanin. If the dark spots on the teeth are due to congenital factors such as fluorosis, bleaching can be performed.