About how pricey are they(In euros)? Any disadvantages? How efective are they?
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The one's you get from your dentist where they make a mold of your teeth and you wear them at night work really good. The disadvantages are they may make your teeth sensitive if you overuse them. But them you can just stop using it for a while and your teeth become normal again. Don't buy Crest Whitestrips, they are horible to apply, they keep on slipping and I never noticed much difference with them. The Laser Whitening is the best, but it is expensive and can burn your gums if they don't aim the laser properly. But it was amazing how white they can get the teeth. It doesn't last that long though if you drink pop and coffee.
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