i just got this pack of tooth whitening powder.. The brand is Eucryl (USA) and it says to use it only 1-2 times a week. So how long would it usually take to get rid of stains (mainly smoking) and whiten teeth?
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2-3 weeks. if you are looking for the best teeth whitening, check out this site http://the-best-teeth-whitening-in-internet.blogspot.com/ You'll get a white and bright smile just in 1-2 days and it'll last for 6 months or longer.
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