1. Genetic factors: Children's dental health may be affected by their parents' inheritance.
2. Eating habits: Children eat too many sugary foods and drinks, and the nutrition is unbalanced, which easily leads to dental caries and periodontal disease.
3. Oral hygiene: children do not pay attention to oral hygiene, do not brush their teeth or brush their teeth incompletely, which is easy to breed bacteria and dental plaque, leading to dental caries and periodontal disease.
4. Living habits: Children's long-term use of pacifiers, thumb sucking and other habits will affect the normal growth and development of teeth.
5. Environmental factors: Children living in heavily polluted environments such as air, water and soil will also affect the health of their teeth.
6. Other factors: children have problems such as mouth breathing, malocclusion and tooth deformity, which will also affect their dental health.