Do they work, and do they wreck your teeth at all? I'm talking about the ones like colgate that claim to whiten your teeth by 7 shades in 5 days or something, it's a cream that you put on your teeth before you sleep... Thanks.
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Try to stay away from those creams that you should leave on your teeth during the night - dentists say those are unhealthy for your teeth. Try something else that is not so aggressive. You can also try bleaching teeth at home. There's huge amount of info about it online.
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