Should whiter teeth feel like a minty nightmare?

I had thought about that when I had the gel-tray in my mouth for alittle more than 10 minutes. Im using Rembrandt to whiten my kinda pearly whites and last night with the gel tray in my mouth it felt like an icy cold torture. When its first worn, it feels fine, then the hydrogen peroxide kicks in and it cools down to a cringing cold blast that is stuck on your teeth. The instructions say you need to keep the gel on your teeth for a half hour. The worst part is that the gel-tray feels like a football player's mouthguard, only it doesn't fit. Um.. not that I know what a football players mouthguard... feels... like...

Um gotta go!