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Excessive saliva is usually a temporary problem and rarely a cause for concern.
Your salivary glands produce 1 to 2 quarts of saliva a day. You don't generally notice the saliva because swallowing occurs continually. If you suddenly seem to have excessive saliva in your mouth, it may be because your salivary glands are making more saliva than usual or because you are swallowing less often.
Causes of increased saliva production include pregnancy, new dentures, any inflammation in the mouth and medications(clozapine, reserpine).
You mentioned you do not have trouble eating/drinking. That is reassuring. Some medical disorders can cause decreased swallowing but most likely not in your case. These include parkinson's, nasal obstruction from allergies, and Sjogren's syndrome(an autoimmune disorder that causes arthritis, dry eyes, dry cough, dry skin).
As I mentioned, most cases of excessive saliva production are benign and should resolve without treatment. However, if your condition worsens, there are medications available to treat your condition. Anticholinergic medications, such as scopolamine, can be used to decrease saliva. However they aren't always effective and can cause side effects.
I hope this answers your question. Take care.