Practice Quiz

ADA NBDHE Dental Hygienist

Category - Provision of Clinical Dental Hygiene Services

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In relation to the Certainly Lethal Dose (CLD) of fluoride, how does the Safely Tolerated Dose (STD) of fluoride compare?
  1. 1/2 of the CLD
  2. 1/4 of the CLD
  3. 1/8 of the CLD
  4. 1/3 of the CLD
Explanation
Answer: B - In relation to the Certainly Lethal Dose (CLD) of fluoride, the Safely Tolerated Dose (STD) is 1/4 of the CLD.
The typical amount of fluoride an individual could inadvertently ingest but safely tolerate is only a quarter of the amount which could cause death. If four times the Safely Tolerated Dose is consumed, emergency action should be taken.
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