Can everyone have their teeth whitened?
No, not everyone can have their teeth whitened. People that are too young or have used medicines such as tetracycline are not eligible for the treatment. Also any discoloration or stains resulting from decalcification; such as excessive use of fluorides and porous teeth will have limited results from the treatment. People born with grey teeth will likewise gain little benefit from the treatment. However, it may be assumed that North American White Smile will have a positive effect for 90% of users, though it is advisable for the teeth to be in good condition and without cavities.
