If your doctor or nurse approves, use hydrogen peroxide diluted with mouthwash or a glycerin/water solution for mouth rinsing. Plain water is best for those who are very sensitive. Your pharmacist can give advice on a gentle mouthwash. 1. Gather supplies - disposable gloves, Toothettes (disposable, foam mouth swabs), mouthwash, warm water in a glass, and a bowl. 2. Cleanse the mouth (roof, tongue, lips, and cheeks) with the disposable swab. 3. Swab the mouth with a Toothette dipped in water and repeat until the foam is gone. 4. Apply a light coat of Vaseline if lips are dry. (Not if the person is on oxygen).