Whitening strips are very thin, virtually invisible strips that are coated with a peroxide-based whitening gel. The strips are applied twice daily for 30 minutes for 14 days. Initial results are seen in a few days and final results are sustained for about four months. {1}

However, I heard from someone that whitening strips can cause gum deterioration.

Are there studies that indicate teeth-whitening strips have negative consequences on teeth or general health?