Thanks for the comments. It won't be these trays you have tried as they don't leak! The problem with leaking trays is exactly what you describe, a higher incidence of irritated gums.
Most whitening products are one of 2 basic formulations and most brands are variations thereof. I use the products of a company called Optident as their product has been around the longest and has the best long term studies. Gel formulations can have very different strengths. Do remember that when done well the procedure is very safe and effective. I personally have whitened my teeth several times!
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