After periodontal disease is cured, the patient still needs daily maintenance so that bad breath disappears and does not return. Periodontal disease is due to the patient’s own clean dental plaque cleaning is not clean, resulting in plaque attached to the surface of the teeth for a long time, gradually mineralized into calculus, until the patient by way of brushing can not be cleaned. So even after curing periodontal disease, patients still need to maintain a good oral hygiene environment, periodontal disease treatment is definitely not a once and for all. If the patient does not learn how to protect the hygienic conditions in the mouth, it is likely that periodontal disease will return and bad breath will return, at which time the patient is advised to communicate with the treating doctor in a timely manner. Therefore, along with basic periodontal disease, routine oral maintenance training should be performed. Brushing is just a basic requirement, but also using a flosser or a gap brush to brush away the adjacent surfaces of the teeth to avoid having plaque retention.