Some women feel as though they're salivating more than usual during pregnancy, especially when they're nauseated. Excessive salivation is more common among women suffering from heartburn or hyperemesis gravidarum, a severe form of morning sickness. No one knows exactly why this occurs. It may be due to an actual increase in your saliva production, a decrease in swallowing (a common behavior when your stomach is upset), or a combination of the two.
To control excess saliva:
Brush your teeth and use mouthwash several times a day.
Eat small, frequent meals.
Drink plenty of water. Keep a water bottle with you and take frequent small sips.
Suck on hard candy or chew sugarless gum. This won't decrease your saliva production, but it will make it easier for you to swallow the saliva you do produce. (Avoid sour candies and gum, which can stimulate saliva production.)
When all else fails, remind yourself that saliva is important because it aids digestion and has antiviral, antifungal, and antibacterial properties that protect your teeth and mouth.