2.7. Questionnaire
Caries
CARIES
Parents of children in the experimental group searched the WeChat Service named “Guangdong Caries Prevention and Control” on their mobile phones to register and fill in the basic information. The researchers provided real-time instructions to fill in the electronic questionnaire online. The questionnaire system was set up to automatically identify whether the questionnaire items were filled out completely and automatically find out the possible logical errors, which could be checked again by the researchers.Trained researchers conducted face-to-face questionnaire interviews with parents of children in the control group.The questionnaire was derived from the Fourth National Oral Health Survey (The basic information of the study participants was kept strictly confidential and subjected to the supervision of the ethics committee.