frankly the people who say it leaves a bad taste e mouth you have never tried baking soda ?? lol that's disgusting the taste! by against the band have rather a pleasant taste, not what not nesont the crest crest because it cost 45 euros, the only downside is the manual in English, because I thought he had to wear 30 minutes from So I removed the first pose and the results were visible, but it had not finished working suddenly I had small white spots unfulfilled, shame me I ('has had to be bilingual! but if not the price I think it's super ok I just not understand why the bottom band was shorter because there are the same number of teeth on the top and bottom ...