Are you twitching in addition to hypersalivation?
If you are, look for manganese toxicity(especially people in big cities or near freeways). Either way, look for metal toxicity. Lead toxicity can cause hypersalivation and the toxicity could even be caused a "non-harmful" metal like barium.
Post Edited (Georgia Hunter) : 10/29/2016 11:01:42 AM (GMT-6)