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In his report, Dr. Donly studied and compared two groups of teenagers who used whitening strips. One group used a 10 percent hydrogen peroxide whitening strip and the other group used a 6.5 percent hydrogen peroxide strip that had a thicker gel layer. The patients used the strips for 44 consecutive days, for 22 days on the upper teeth followed by 22 days on the lower teeth.
Participants in the study used the strips for 30 minutes twice daily. Use of the strips resulted in significant color improvement for yellowness and lightness/brightness. With the whitening strip systems, the most common complaints were tooth sensitivity and oral irritation, both of which subsided at the end of treatment.