You brush your teeth every day, but are you doing it properly? Here's how to brush: Hold your toothbrush at a slight angle against your teeth and brush with short back-and-forth motions. Remember to brush the inside and chewing surfaces of your teeth, as well as your tongue. Avoid vigorous or harsh scrubbing, which can irritate your gums. Or use an electric toothbrush. Either way, brush your teeth at least twice a day: in the morning and before you go to bed.