1. Dental caries: If children's oral hygiene is poor, food residues and bacteria will form an acidic environment on the tooth surface, leading to demineralization and dental caries. Dental caries may cause teeth to turn black.
2. Trauma: If the child is hit or otherwise traumatized during sports or play, it may lead to broken or damaged teeth, which may lead to blackening of teeth.
3. Side effects of drugs: Some drugs (such as tetracycline antibiotics) may affect the development and color of teeth, leading to blackening of teeth.
4. Other diseases: some diseases (such as anemia, diabetes, etc. ) may also affect the color and health of teeth.
If the child's teeth are black, it is recommended to take the child to the dentist for examination and treatment in time.