Regardless of the type of product you use (professional or over-the-counter), the results are not permanent and usually last about three to six months, depending on your general dental hygiene and what you eat and drink. It is not recommended to use a whitener more than once every six months. Your dentist may be concerned if you are using the product too frequently or leaving it on beyond the time instructed.
If you are using the product as directed, however, it should be safe and not hurt your teeth. In terms of regulation, tooth whitening treatments are reviewed by Health Canada to check that they have proper safety labelling and instructions, but the ultimate safety of the product is the responsibility of the manufacturer.
When searching for a good product, look for a seal of approval from theCanadian Dental Association. Despite all of this, there can be some side effects.
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