A mouth full of cavities, mainly from the systemic factors and oral local factors to protect the teeth from further deterioration, such as dry syndrome, may require hormone and other drug therapy; local factors including proper brushing, regular cleaning, etc.. 1. Systemic factors: for some patients with related systemic diseases, such as dry syndrome, post-cancer radiotherapy patients, can lead to the occurrence of oral caries, etc., it is recommended to control or cure the systemic diseases as soon as possible, such as dry syndrome, which often requires hormone and other drug therapy. 2. Local factors: It is recommended to treat tooth decay in the mouth first, and then use the correct way of brushing and regular checkups and teeth cleaning every 6~12 months to improve the bad habits of drinking carbonated beverages for a long time and maintain oral health. It should be suggested that tooth decay needs to be treated as early as possible, otherwise it will continue to progress and delay the condition, leading to pulpitis or even extraction. It is recommended to go to a regular hospital stomatology department for examination and listen to the advice of the physician.