What is the difference between premium Crest Whitestrips and regular?
Crest makes the claim that the premium ones take only 7 days to whiten teeth while regular ones take 14 days. Incidentally, Professional Whitestripsavailable only from dentistshave a higher concentration of hydrogen peroxide and contain 84 strips compared to the 56 strips in the retail version. The regular oones from the pharmacy/grocery store, the Professional ones from the dentist.