Teeth have dirt, if it is soft dirt, you can use daily care to clean the teeth, if it is calculus or plaque formation, you can use supragingival cleaning, sandblasting, subgingival scraping and other ways to remove the plaque. 1. Soft dirt: If it is only soft dirt, you need to pay attention to oral hygiene, insist on brushing every morning and evening, insist on rinsing with lukewarm water after meals, and use dental floss appropriately to clean up the food debris and soft dirt, and to avoid food clogging can occur. 2. Dental calculus, plaque: Once formed, dental calculus can not be removed by brushing and other means. You need to go to the doctor for scaling to remove the tartar. According to their own situation can be used on the gingival cleaning and subgingival scraping way, the teeth above or below the hard calculus and plaque clean. Root planing can be done on individual teeth if needed. If there is dirt on the teeth, you need to go to the hospital regularly to clean the teeth, so as to avoid the dirt remaining for too long will form hard stones, which will increase the difficulty of treatment. If you usually have the habit of smoking, try to quit, so as to avoid residual pigmentation.