Tooth decay in milk teeth needs to be filled, because children have complete teeth to better chew food, which is conducive to gastrointestinal absorption, otherwise it may cause the following hazards: 1, if the milk teeth are decayed, first of all, food will often be embedded, and after the food is embedded, it will cause oral odor, and after a long time, it is easy to decay deeper and deeper; 2, because the milk teeth have nerves and blood vessels, if the milk teeth are decayed to the nerve, it will cause tooth pain, and children will not dare to eat. 3. Serious tooth decay will lead to the loss of milk teeth, which will cause the lack of space for the eruption of permanent teeth and may lead to malocclusion and malocclusion; 4. If the milk teeth are lost early, the chewing efficiency will be low after eating and the food will not be chewed well, which will increase the burden of the gastrointestinal tract and lead to malnutrition. Therefore, there are many kinds of hazards for decayed milk teeth, so please take children to the hospital in time if they have decayed milk teeth.