When patients have oral ulcers, taking vitamin C can help repair the ulcers to some extent. However, it is generally recommended that patients use local medications in the mouth, which can provide quicker and more noticeable results. Sprays specifically for oral ulcers can be directly applied to the affected areas, or patches designed for oral ulcers can be adhered directly to the lesions, which can effectively help in healing the ulcers. Additionally, patients may appropriately take some oral vitamins that can effectively enhance the body's resistance and aid in the recovery from certain ailments. It is important to maintain correct dietary and lifestyle habits and pay attention to oral hygiene.