How long it takes for a patient to heal from a white ulcer on the tonsil depends on the extent of the ulcer. If there is only a small area with an ulcer, it can heal in about a week with aggressive treatment. If the patient’s tonsils are mostly filled with white ulcers, it often takes half a month, or even half a month to a month, to heal. Although the patient has ulcers, they still need to pass through the mouth to eat which can easily lead to infection around the ulcers. Also, the tonsils are immune organs and may become hyperplastic and inflamed after being irritated. It is recommended that you can spray with open-throat sword spray treatment, as well as gargle with compound tinidazole containing solution, and gargle with light salt water after meals, which can reduce the infection. You can also take three days of oral antibiotics for prevention, commonly used in clinical practice is roxithromycin capsules.