Shark’s teeth may be caused by excessive consumption of sweets, not brushing teeth on time, and tooth replacement period. 1. Too much sweets: desserts are usually sugary, there are lactobacilli in the mouth, in contact with sugar, will produce an acidic substance, there is a certain degree of corrosiveness to the teeth, because the children’s teeth are milk teeth, if they are corroded, they will become shark teeth. 2. Not brushing on time: If children do not develop a good habit of brushing, then the bacteria in the mouth will ferment with the food in the gap between the teeth and destroy the teeth, which will lead to the formation of shark teeth. 3. Tooth replacement: when the baby reaches the age of tooth replacement, the original milk teeth will slowly fall off, while the permanent teeth will slowly grow, sometimes in the baby’s milk teeth have not completely fall off before the permanent teeth will grow, there will be shark teeth. If your child has shark teeth, it is important to take your child to the dentist for an early checkup to avoid adverse effects.