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Title: Ouch!
Review: I've used the lower dosage version of this product for a few years after getting started with it at the dentist's office. The whitening results are great, but after using this 9.5% gel for 20 minutes, I experienced intense, shooting pain in one tooth and had to remove the product before the recommended minimum of 30 minutes. It's strange because I do have one particular tooth that is quite sensitive, but that one did not bother me at all during the treatment and a tooth that has never bothered me reacted so strongly. I plan to continue using the 9.5% product in shorter intervals and hope to prevent further pain/sensitivity, but this may not result in good whitening.In the future I will stick to the 7.5% strength, which caused only mild sensitivity with use. If you have sensitive teeth, you should definitely go with the weaker solution.
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