2.3. Eligibility criteria
mental illness, allergy, physical disabilities
SYSTEMIC DISEASE, ALLERGY
Inclusion criteria: second-grade students aged 6–8 years at baseline, able to cooperate with the oral examination and questionnaire survey, no history of mental illness, no history of systemic diseases, no history of long-term drug use, no history of allergy, no participation in other programs, and able to continue to participate in this program within 1 year. The legal guardians of the children in the study had WeChat accounts and electronic devices with Internet access and were able to cooperate with the researchers to complete relevant online research projects. The legal guardians of the children in the study had a good understanding of the study and the willingness to sign relevant informed consent forms.Exclusion criteria: children with intellectual or mental illness, children with severe physical disabilities, children who were unable to cooperate with the examination, and children who were ready to transfer to another school within 1 year.