The mouth always secretes saliva if it is caused by food stimulation, generally do not need treatment, if the oral hygiene is poor and neuromodulation obstruction caused by, can be under the guidance of the doctor in time to clean the oral hygiene or take nutritive nerve drugs for treatment and other drugs. 1. Diet can stimulate: when the patient smells the food flavor, in these factors for food influence condition and reflex stimulation, it may directly lead to salivary gland secretion, there is always saliva in the mouth of the phenomenon. 2. Poor oral hygiene: Failure to clean the mouth in a timely manner may lead to accumulation of food residues or sugar on the surface of the teeth, which may easily lead to tooth decay. These undesirable factors will stimulate the salivary glands, resulting in a large amount of saliva. Oral hygiene should be cleaned in time and teeth should be brushed actively after meals. 3. Neuromodulation blockage: The regulation of salivary secretion in the mouth is accomplished by the nerve reflexes of the brain. When the neuromodulation is blocked, the secretion of saliva may increase and saliva may appear in the mouth. Methylcobalamin can be taken under the guidance and advice of a doctor. When the patient appears to always secrete saliva in the mouth, go to the hospital to see the doctor in time, and actively cooperate with the doctor’s treatment after confirming the cause of the disease.