The appearance of small white spots on the teeth may be due to dental calculus, dental fluorosis, dental caries and other causes. 1. Calculus: It is caused by the mineralization of plaque, soft scale and food residues that have existed on the surface of the teeth for a long time. It starts as a milky-white soft tartar and hardens due to gradual calcification, resulting in the appearance of small white spots on the teeth. 2. Dental fluorosis: a special kind of enamel hypoplasia caused by excessive fluoride intake during the period of dental development and mineralization. The patient’s enamel surface can form white spots due to abnormal mineralization. 3. Dental caries: mainly due to the wrong way of brushing, poor oral hygiene and other reasons, so that bacteria adhere to the surface of the teeth for a long time, decomposition of acid, so that enamel demineralization, and plaque microorganisms in the role of acid and enzymes so that demineralization of the enamel and part of the remineralization, will cause the teeth to have a white spot produced. It is recommended that patients with small white spots on their teeth go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying their condition.