People who often have mouth sores should avoid eating spicy and irritating foods, as well as foods with particularly high temperatures and hard textures. Drink more water and eat more fresh vegetables and fruits to replenish sufficient vitamins. In the diet, light, warm and soft foods should be the mainstay, while also ensuring balanced nutrition and encouraging the consumption of fruits rich in vitamin C, such as watermelon, kiwi, grapefruit, orange and dragon fruit. At the same time, you can also take a moderate amount of tea with the function of clearing heat and lowering fire, such as honeysuckle tea, chrysanthemum tea, bamboo leaf tea, etc., which are conducive to preventing recurring mouth sores. In addition, you can also take the appropriate amount of drugs that have the function of clearing heat and lowering fire, such as clearing fire gardenia tablets, niuhuang Shangqing pill and niuhuang detoxification tablets, which is also conducive to the healing of mouth and tongue sores.