A key reason is their ongoing use, combined with the fact that small amounts of bleach remain within the tooth structure for up to 36 hours. When a new dose of bleach is applied to a tooth retaining the previous day's peroxide, its effect is greater.
Although you can get over-the-counter whiteners without a dentist's recommendation, if you over-use them or use them incorrectly, they can harm your tooth enamel and irritate your gum tissue. Also, over-bleaching can produce an undesirable bluish hue, chalky whiteness or uneven results (otherwise known as 'the technicolor effect').
Supervision by a dentist can prevent these problems. To ensure the health of your smile, see your dentist before choosing an over-the-counter tooth whitener and beginning the bleaching process.
Dentists know a lot about these products and can help you choose the right one and use it correctly.
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