White spots on teeth may be enamel hypoplasia or fluorosis. White spots on teeth are a common phenomenon, mostly seen in the front teeth of the upper jaw, where a chalky white change appears on the surface of the teeth. The outermost part of a normal tooth is the enamel, which is colorless and transparent. The color of the tooth is the color of the dentin inside, which is milky white for milk teeth and yellowish for permanent teeth. The development of enamel is mostly done during maternal pregnancy. During the calcification period of the teeth, if the mother is deficient in vitamins or trace elements, especially calcium, it can lead to poor enamel mineralization and white patches on the teeth. White patches on the teeth can also be dental fluorosis, which is fluorosis that occurs when there is too much fluoride in the body. Pregnant women and infants with a history of living in high fluoride areas, such as coal-rich areas, with excessive fluoride levels in the water or diet during the maternal phase or within three years after birth can develop dental fluorosis, with white patches on the teeth. Less serious cases can be restored with cosmetic dental resin, and serious cases can be restored with porcelain teeth. So white patches on teeth may be the result of underdeveloped enamel due to poor dental calcification or fluorosis in the body.