The common causes of teeth discolorations and stains are black tea, coffee, tobacco, red wine, cola drinks; or by age. In some cases, too much fluoride or the antibiotic tetracycline can cause staining to occur as well. Having stained teeth makes us conscious and we can't help but consider any type of tooth whitening. However, choosing and buying a teeth whitener is not a no-sense thing, it is important to remember that if you intend to have any fillings or tooth replacement, complete your tooth whitening first. The coloration of any dental work will not be affected by whitening and it is better to have your dentist match the restorations to your new shade of white. There are many available teeth whitening treatments that can remove stains like whitening toothpastes, whitening strips, over-the-counter tooth whitening kits, professional treatments, and professional take-home kits. Too much use of the over-the-counter bleaching products can wear down the enamel on your teeth. Read the ingredients and avoid any that contain acid or abrasive substances like bicarbonate of soda.