Does teeth whitening really work? - Smile Exchange
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  1. What causes teeth stains?
  2. How can I whiten my teeth?

Have you been staring in the mirror lately wishing you had a whiter, brighter smile?

There are many potential causes for teeth staining. Many have to do with the foods you eat and what you drink. Dark colored foods like raspberries or eating lots of red sauces, as well as drinking coffee and wine can all contribute to teeth staining.
Fortunately, there are ways to fight teeth staining and get the white smile you want.

A whitening toothpaste or rinse can be a low cost solution for whitening your teeth. These can help remove surface stains or, depending on the brand, contain small amount of hydrogen peroxide which helps to bleach the teeth.

Whitening gums and strips are another affordable way to whiten your smile. Chewing gum helps remove food from teeth and increases saliva production, which helps with decreased staining. Whitening strips use a peroxide gel to remove stains and whiten your teeth.

Tray-based whitening kits are sold either over-the-counter or through your local dentist. These provide a great whitening effect than toothpaste, rinses, gums or strips. The trays are used up to once per day for typically 30-60 minutes to help keep your smile bright.

The most effective way to whiten your teeth is with in-office teeth whitening at your local dentist’s office. There, a higher concentration of peroxide is used, providing the maximum whitening effect.
Keep in mind, the best way to prevent staining and the need for whitening if with good oral hygiene. Brushing twice daily, flossing and going to the dentist regularly can all help keep your smile white and bright.

Source: https://www.colgate.com/en-us/oral-health/cosmetic-dentistry/teeth-whitening/three-proven-tips-to-keep-teeth-white-0213, https://www.colgate.com/en-us/oral-health/cosmetic-dentistry/teeth-whitening/four-types-of-teeth-whitening-products-1014