Cavities are caused by a combination of things, including not brushing your teeth well or often, bacteria, sugary drinks, and more. However, there are ways to help prevent cavities from forming in the first place. Brush with fluoride toothpaste after eating, and be sure to use a fluoride mouthwash as well. Avoid frequent drinking and snacking throughout the day, especially with sugary foods. Make sure you are using proper brushing techniques to get rid of the plaque on your teeth. Ask your dentist to show you how if you aren’t sure you are using proper technique.