White spots inside the mouth is a common problem in the oral cavity. There are many causes of white spots in the mouth, the common one is mouth ulcers, mouth ulcers are mouth sores, mouth ulcers are mostly caused by low body immunity, long-term staying up late or lack of vitamins in the body, etc. Trauma can also lead to mouth ulcers. Chinese medicine believes that mouth ulcers are caused by wind, heat, moisture and evil, and the internal cause is the heart, spleen, kidney and other internal organs disorders. For the treatment of mouth ulcers, it is important to regulate the mind and keep it happy, but also to reduce staying up late, smoke less, drink less, and not eat spicy and stimulating food. This can regulate the body’s own immunity, daily diet to strengthen the intake of vegetables and fruits, so that the body’s immunity to improve, from the root to eliminate the occurrence of mouth ulcers. If the white spot is located in the posterior area of the molar, it may be an ectopic sebaceous gland, which is a normal physiological phenomenon and does not need to be treated.