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Definitely Whitestrips. After 5 applications I could see a massive difference. I have another box to do them again and it's the hour ones not the half hour though and I just haven't been bothered. I've always had the professional effects ones. No idea what these are - my dad went shopping for me in the US.
In the UK there is a strict limit on the amount of bleach that can be sold in over the counter whitening products. So in practice none of them work - as most beauty products have careful wording and dont work, this is standard.
If you want actual whitening, you go to someone who spent years at dental school and will be able to do something without wrecking your teeth.
America likes the horse with a piano in its mouth look and so there is no regulation there. You can buy their products online and get them sent here. You do risk looking ridiculous now and toothless later.
I get my teeth professionally whitened as a perk of my job. There's a good reason why these products are illegal in the UK, if they're unregulated they can do permanent damage to your teeth, and burn your gums.
In the UK you aren't allowed to use anything stronger than a 6% mix, which can still give you very good results.
In EU the maximum amount t of whitening agent is 0.06% if it has a cosmetic ie toothpastes. The maximum in a dental product that is licences for dentists to use is 6% is 100 x more. no-one except a dentist can use / supervise the use of these, it doesn't matter if a beautician has been on a course or not it is the illegal practice of dentistry. Crest whitestrips do not have a license to be sold any where in Europe Use of stronger d products can weaken enamel cause chemical burns on the gum or cause extreme sensitivity