Tooth whitening can improve the look of your pearly not-so-whites, but can they damage your teeth?
Teeth are an important part of physical appearance for many people, and they want to show a bright white smile.
Studies have shown that most human teeth are not naturally pearl-white.
In reality, most teeth are different shades and hues that tend towards yellow. Nor are teeth uniformly colored.
► See also:Taking DENTAL IMPRESSIONS : Correction Impression
Fuente: Youtube / BBC Earth Lab
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