The causes of excessive salivation in the elderly may include denture stimulation, oral inflammation, neurological abnormalities, etc., as follows. 1. Denture stimulation: commonly found in complete denture or large size removable partial denture, because of the stimulation of foreign body sensation, resulting in increased salivary secretion. 2. Oral inflammation: all kinds of oral inflammation, such as gingivitis, periodontitis, oral ulcers resulting in pain, as well as oozing inflammatory factors will stimulate the salivary glands to secrete saliva. 3. Nervous system abnormalities: sympathetic and parasympathetic nerves are related to the secretion of salivary glands. Nervous system abnormalities, such as parasympathetic excitation, can lead to increased secretion of salivary glands. There may also be other causes of excessive salivation in the elderly, such as Parkinson’s syndrome, stroke can also appear involuntary salivation. It is recommended to visit the hospital for timely examination and treatment.