Some common adverse reactions may occur while taking targeted drugs, but they are generally mild to moderate. Even if disturbing adverse reactions occur, it is recommended that you should not discontinue the drug on your own, as this may affect the progress of treatment. Some self-care practices can help improve the situation. Stomatitis is a disease that refers to inflammation of the oral mucosa or tongue mucosa, mostly occurring about two weeks after starting the drug. Symptoms are ulcers and redness in the mouth or tongue, pain and discomfort. Good personal hygiene habits and timely medication can reduce the incidence of stomatitis and mitigate the impact of stomatitis on life. Change the diet: 1. Avoid hard and brittle foods that damage the oral mucosa; 2. Avoid spicy, sour or salty foods and drinks; 3. Avoid overheated foods and drinks. Maintain good oral hygiene: 1, regularly rinse/rinse mouth with baking soda (or light salt water); 2, brush teeth regularly after each meal; 3, use mild toothpaste (such as children’s type) and soft-bristled toothbrush; 4, encourage regular dental check-ups; 5, do not use commercially available mouthwash indiscriminately, do not use drugs or mouthwash containing alcohol, iodine (Wassup tablets), hydrogen peroxide and thyme derivatives (muscimol, commercially available (Most mouthwashes contain this ingredient.) Before taking medicine, how can we avoid stomatitis? 1, rinse your mouth with warm water; 2, clean your teeth regularly if conditions allow; 3, use a soft-bristled toothbrush; 4, use lip balm to keep your lips moist; 5, clean your mouth; 6, use mouthwash to maintain oral hygiene. When taking medicine, how can we avoid stomatitis? 1. avoid prolonged contact between the medicine and the mouth; 2. use rice balls or butter to wrap and deliver the medicine; 3. rinse the mouth with plenty of water when taking the medicine; 4. prohibit spicy or acidic food. When stomatitis has occurred, how do we deal with it? 1, drink more water, sucking ice cubes or flavored lollipops; 2, food is room temperature or lower; 3, use diclofenac mouthwash or rehabilitation new mouthwash gargle. Remember to gargle for a while, so that the liquid is fully absorbed under. Don’t mind the taste and then immediately rinse off with water, in which case it will be white rinse; 4, there are more than three oral lesions or intolerable oral lesions, it is recommended to find a dentist symptomatic treatment.