After suffering from mouth ulcers in the diet must pay more attention. So what are the dietary contraindications of mouth ulcers? 1, avoid using tobacco, alcohol, coffee and stimulating drinks. 2, avoid excessive consumption of acid, alkaline, spicy or baked fried food. 3.To reduce the friction of the ulcer, so eat less fried food and other foods that are too rough and hard, such as fried ribs, fried chicken legs, nuts and so on. 4, to reduce the stimulation of the ulcer surface, try to eat less irritating condiments, such as chili, vinegar, ginger, onion, star anise, etc.. These foods will not only induce pain, but also stimulate the ulcer surface and make it expand further. 5, do not eat too hot food, boiling water or boiling soup does not kill the ulcer surface bacteria, but will cause irritation. Therefore, wait until the food cools to room temperature before eating is the best choice.