1, to ensure adequate water intake, the daily water intake should reach 2000-2400 ml. 2, Quit smoking and alcohol. 3, avoid taking drugs that cause dry mouth, such as alpha blockers, beta blockers, antidepressants, paracetamol, atropine, etc. 4, avoid eating spicy, dry, warm products, such as wine, tea, coffee, all kinds of fried food, mutton, dog meat, antler, venison, cinnamon, as well as ginger, onion, garlic, chili, pepper, pepper, fennel, etc., to prevent dryness and injury, aggravating the disease. 5, eat more nourishing yin and clearing heat to produce Jin food, such as fresh lotus root, loofah, celery, red pedicel, yellow cauliflower, wolfberry head, watermelon, banana, fresh pear. 6, dry mouth and tongue can often contain plums, Tibetan green fruit, or often drink lime juice, lemon juice and other thirst-quenching drinks. 7.Keep the oral cavity clean, rinse the mouth regularly, build less dental caries and oral secondary infection.