Excessive salivary secretion always gagging is recommended to go to the dentistry department of the hospital for examination to see if there are bad quality prostheses in the mouth. Poor quality dentures in the mouth may stimulate salivary gland secretion and lead to excessive salivation. In addition, it is also necessary to check the health of the oral cavity to see if there are diseases such as gingivitis and periodontitis, gingivitis or periodontitis may also lead to excessive salivation, and it is also necessary to check the occlusal relationship of the teeth to see if there are any dental abnormalities. It is recommended to take out dentures of substandard quality, if there is gingivitis and periodontitis and other diseases, it is recommended to carry out periodontal treatment as soon as possible, if the bite relationship is poor, it is necessary to adjust the bite relationship in a timely manner, to exclude oral causes, excessive saliva may also be related to the gastrointestinal digestive function.