Excessive saliva will make you drink more water and take gas medicine. Again some people become accustomed to spitting excessively. If so, try to eliminate it. You can put chewing gum and chocolate in your mouth . And you can keep betel in your mouth , chew betel without betel nut , also eat neem juice, it will stop excess saliva. If you have more problems, take the advice of a doctor. Thank you!