Cavities have a high incidence rate, especially during childhood. If oral care is neglected, dental decay can occur, thus the prevention of cavities is very important. The main cause of cavities is dental plaque, which necessitates good oral hygiene. It is essential to develop the habit of brushing teeth daily with the correct technique. It is important to start teaching children to brush their teeth after they turn three, striving to brush once in the morning and once at night, rinse after meals, and particularly brush before bedtime. It is also advisable to reduce the consumption of sugary foods. Currently, the best prevention method is to apply a dental sealant, which is a protective coating on the teeth to shield them from bacterial erosion. If decay occurs, it is crucial to seek immediate treatment at a hospital to repair the damaged dental tissue and restore health.