Many people think brushing real hard and long and very hard at least twice a day will keep their teeth white? NO! wrong, according to dentist and experience dentists and other people. Brushing too hard and maybe too much as well (more than 3 times a day) is a bad idea, “You will wear down your enamel and cause your gums to recede. Certain foods and drinks causes your teeth to stain such as colas, teas, coffee, wine, soy sauce, berries and of course smoking. You may need a little help such as whitening strips and rinses. Listerine has one that you rinse before you brush and it will whiten your teeth. So as I said before do not brush your teeth so hard, make sure you are using a soft toothbrush and check out the toothpaste isle for teeth whiteners.” – dental assistant 7 years