If you have white spots on your teeth you should watch out for diseases such as cavities, dental fluorosis, and enamel hypoplasia. Diseases can be prevented by regular brushing, rinsing and timely medical checkup of the teeth. 1. Cavities: In the early stage of dental caries, teeth will be decalcified and white spots will appear. As bacteria adheres to the teeth for a long time, it will produce acid, which will cause demineralization of enamel, and the acid and enzyme in plaque will cause demineralization of enamel and localized mineralization, so it is necessary to pay attention to oral hygiene. 2. Dental fluorosis: Because excessive fluoride intake can cause dental fluorosis, it may also be due to the quality of drinking water. For example, drinking highly fluoridated water for a long time will cause excessive loss of calcium in the enamel, resulting in white spots on the surface of the teeth, so be sure to brush and rinse your teeth on time. 3. Enamel underdevelopment: White spots on teeth are caused by undermining of teeth in the mineralization stage, which is a kind of enamel underdevelopment and is caused by lack of calcium. This is a form of enamel hypoplasia, which is caused by a lack of calcium. You can take calcium supplements to alleviate the symptoms and visit your doctor regularly to check your dental health. If you have white spots on your teeth, you should pay attention to maintaining good oral hygiene, and if the white spots get worse, you need to seek medical treatment.