I had this problem very BADLY.....I was told to eat mints...it worked for a little bit but kept coming back. Thos is my 5th child and every pregnancy I had it. I would literally carry a spit cup with me..but the bright side is that it only lasted throughout the first trimester.....
I had constant saliva in early pregnancy along with nausea, i had nausea tablets prescribed and it stopped
Ice water and chewing gum can help.