By Anonymous - 08/11/2009 11:12 - Germany
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It means they don't use tooth whiteners or toothpaste containing it, which really aren't that great for your teeth anyway. It means they don't have any of the fluorescent additives that are i whiteners that will glow under blacklight. It doesn't mean their teeth are yellow or unclean. The cleanest and whitest teeth in the world aren't going to glow under blacklight if there no fluorescent additive from whiteners on them. If anything, it means they have healthier teeth than their friends because they're not stripping the enamel off their teeth.
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Unnaturally? Its a black light; therefore, white things glow. If his teeth didn't glow, then they weren't white. Do you find the look of yellow teeth attractive? Nothing agaisnt you if you do, but the norm is white, just sayin.
Only fake teeth glow in a black light. You were the only one there with real teeth.