Whether you use an electric or still prefer a manual brush you should hold the brush at a 45-degree angle to your teeth. Gently but thoroughly rotate the bristles across your teeth and under your gums with a backward and forward motion. Be sure to also get the top surfaces of your teeth where you bite or chew on food. Your tongue can also be cleaned with your toothbrush, which will help reduce bad breath. Lastly it is important to brush the inside surfaces of your teeth with the same rotating motion.
When brushing, it is important to use toothpaste that contains fluoride. Fluoride helps harden the outer layer of the tooth, called enamel, which will prevent cavities and also reduce bacteria in the mouth. It can also reverse the formation of smaller cavities.