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These data were further used to calculate Cohens f 2 based on the formula of Selya et al

It also contains fluoride to prevent cavities

For most people, getting rid of the source of irritation such as stopping tobacco or alcohol use clears the condition

Over-the-Counter Teeth Whitening While so many over-the-counter teeth whitening products may work for some, they may not be as effective for everyone else

NEWS Smoking scars the immune system for years after quitting Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Subscribe to this journal Receive 52 print issues and online access $199.00 per year only $3.83 per issue Rent or buy this article Prices vary by article type from$1.95 to$39.95 Prices may be subject to local taxes which are calculated during checkout doi: Read the related News & Views: Smokings lasting effect on the immune system