(Concern) I frequently get cavities, and I don't know how to take care of my teeth.

I brush my teeth twice a day after breakfast and dinner. At lunchtime, I rinse my mouth with mouthwash. However, I am worried because I frequently get cavities. What are some good ways to delay cavity formation and maintain good oral health? Are there any methods besides brushing and rinsing? I want to know simple and effective dental care methods that are not complicated or time-consuming.