Maintain mouth hygiene. This means brushing the mouth with a soft tooth brush after eating anything. Every two hours use a mouthwash, such as one that produces an effervescent wash (a mixture of one part Cepacol, one part saline solution, and one part 3 percent hydrogen peroxide) or glycerin and citric acid washes, which may help stimulate salivation. Ask the doctor or oncology nurse for a recommendation.