Most people with frequent mouth sores are caused by recurrent mouth ulcers, and there are several points to note for this group of people: first, avoid spicy and irritating foods, foods with particularly high temperatures and hard textures, and light, warm and soft foods in the diet, as well as fresh vegetables and fruits to replenish the vitamin C in the body. Most people with mouth sores are caused by a lack of vitamins and trace elements, which can be supplemented by dietary therapy, or by taking oral multivitamin tablets, zinc gluconate oral solution or iron supplements. Finally, people who often have mouth sores should pay special attention to oral hygiene, brush their teeth and rinse their mouths carefully to reduce the number of disease-causing factors in the mouth, and if there are diseases such as root stumps, crown stumps, overly sharp tooth tips and caries in the mouth, as the teeth or tooth tips can often scrape or bite the mucous membrane can also cause traumatic ulcers, and these dental diseases should be treated actively.