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I have the professional ones that you buy from the dentist. They don't taste every good. It's a little time consuming as well, but it does work. My teeth are noticeably whiter than when I first started.
Tooth sensitivity is definitely a downside. It hasn't been too bad for me, but I've heard of people that buy them and then stop using them because of that.
The professional ones are stronger than the ones that you buy in the store, so I don't know how well those the store-bought ones work.
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