Dental fluorosis is a cosmetic condition that affects the appearance of teeth due to excessive exposure to fluoride during childhood, when teeth are still developing. It can result in white spots, streaks, or even brown discoloration on the enamel, which is the outer layer of the teeth. The severity of dental fluorosis varies, with mild cases showing only small white flecks, while more severe cases can lead to pitting or significant discoloration. It is important to monitor fluoride intake from sources like toothpaste, drinking water, and supplements to prevent this condition.