Excess saliva can signify dental problems such as tooth decay, gum disease, or abscesses. When there is damage to the teeth or gum tissue, it can trigger the salivary glands to produce more saliva to wash away the bacteria. Saliva also contains enzymes that help break down food, so an increase in saliva production can also be a sign that the body is trying to digest something irritating the mouth or throat. In addition, certain medications, such as antihistamines, can cause dry mouth, leading to excess saliva production.