Drooling, or dribbling, is the unintentional loss of saliva from the mouth.
It occurs in infants, but as the infant gets older it usually decreases. Daytime drooling stops within the first few years of life, though older children may still drool during sleep. Beyond the age of about 4 years, it is unusual, unless there is an underlying medical problem.
Why does drooling occur?
Drooling beyond infancy may occur in some medical conditions such as:
when there is inflammation of the mucous membranes of the mouth
or as a reaction to some medications, which cause an increase in saliva