National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the lowest level of Fluoride in drinking water that will cause enamel mottling?

1.0 ppm
2.0 ppm
3.0 ppm
4.0 ppm

The correct answer is: 3.0 ppm

The lowest level of fluoride in drinking water that can cause enamel mottling is 3.0 ppm. This is because fluoride naturally occurs in water and when consumed in excess, can cause cosmetic changes in the tooth's enamel. Options A, B, and D are incorrect because the higher concentrations of fluoride in those levels can lead to more severe dental fluorosis, a condition that affects the appearance and strength of teeth. While low levels of fluoride can have positive effects on dental health, it is important to monitor and regulate the concentration in drinking water to prevent any adverse effects.