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my dad's a dentist and i work as his assistant from time to time so i guess im qualified to answer this question. anyways just about everything you can buy over the counter is crap. go to your dentist if your serious and he can give you the professional white srips or he can give you this clear retainer thing(fits right around your teeth under the gums so you can't tell) that you can fill with wightening gel he'll give you. the latter is what my dad himself used.
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