why is this? and my teeth are not getting any lighter.
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Are you using strips or gels? I know that strips cause these sorts of problems because they pretty much bleach your teeth ie. take off a layer of your enamel thus exposing fresh enamel and becoming sensitive. You should either have a dentist do it or buy some gels. Stay away from strips. Remember, you get what you pay for. Strips are cheap, thus result is cheap. Gels are expensive, but results last and are healthy. -MasterJ
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