My 5 year old grandson spits compulsively. My wife and I have observed this seemly non normal behavior for a couple of months now. Physically he seems to be a normal healthy kid from top to bottom; no learning disabilities or behavioral problems. However my wife and I feel compelled to get a professional opinion. Should our diagnosis begin with a doctor or a dentist?
Get a torch and look inside the of the baby and try to look if the teeth are all normally aligned or some of the teeth is causing pressure on the inside of cheek? If you could find nothing and the child does not complain of any pain sensation, it's not a dental problem. Then I would not prescribe any medications and ask you to maintain proper oral hygiene with any mouth wash. It's a habit and will resolve slowly with your care.