Teeth whitening has individual differences but can be seen to be effective more than almost 90%. You should not stop teeth whitening that has not worked right away. Like your skin, you should keep your teeth from becoming yellow.
What Causes tooth staining
Teeth continue to yellowish coloring.
Tooth whitening is to restore the original bright color
on-site tooth whitening at the exhibition
Amazing immediate teeth whitening effect
User's SNS Reviews
A surprising change from yellow to white teeth
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