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The instructions are super simple, the total set up time is under about 3 minutes. Once you get it set up it's pretty straightforward. I haven't experienced any sensitivity issues. The result seemed good, noticeable each time you use it. I would imagine you have to use it somewhere around five to seven times to really see some significant results. I would space-out the sessions by at least a few days each time, not to have to deal with any sensitivity issues that are associated with whitening. Great product!
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