It says "Easy to use"; Simply apply the gel with the applicator brush and keep the light in your mouth. What they don't say is that you will have so much saliva that the whitening gel will be gone long before the 20 minutes are up. I find myself either reapplying the gel or trying to lay on my back so the gel doesn't wash out. I can see a slight lightening effect, but not much. No sensitivity I haven't had. I'm not sure if the product is worth $20 because I expected more whitening effect.
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