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rgasio rgasio
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Posts: 814
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6 years ago
Tray home whitening systems can be sold OTC. Which of the following are disadvantages of tray systems sold OTC?
 a. Do not adapt to teeth properly
  b. Not trimmed to prevent tissue sensitivity
  c. Both a and b
  d. None of the above
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wrote...
6 years ago
c
RATIONALE: Over-the-counter tray systems do not adapt to teeth properly and are not trimmed to prevent sensitivity.
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