Creating too much saliva is usually not a serious sign, and can be caused by an overactive salivary gland(certain inflammation in glands might cause that), having problems swallowing,smelling food,gingivits ,teeth problems , or from eating spicy or sour food. Having too much saliva on a constant basis could be the side effect of particular medications such as clonazepam, clozapine or pilocarpine, or be a symptom of a more serious condition. Conditions that might cause the production of too much saliva include:
Pregnancy
Lou Gehrig's disease
Bell's palsy
Cerebral palsy
GERD
enlarged tongue
Parkinson's disease
Rabies
Stroke.
Contact your doctor if you are having prolonged signs of saliva overproduction
•