INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the toxic dose for fluoride, measured in mg/kg?

2mg/kg
3.5mg/kg
5mg/kg
7mg/kg

The correct answer is: 5mg/kg

Fluoride is a naturally occurring compound found in water and soil, and in small amounts, it can be beneficial for dental health. However, excessive amounts can lead to toxicity and have harmful effects on the body. The toxic dose of fluoride is typically measured in milligrams per kilogram of body weight (mg/kg). This unit of measurement is used to calculate the amount of a substance that can cause harm based on the person's weight. Option A (2mg/kg) is too low as the toxic dose for fluoride is much higher than this. Ingesting this amount of fluoride would not cause toxicity. Option B (3.5mg/kg) is closer to the actual toxic dose compared to option A, but it is still too low. Option D (7mg/kg) is too high and could lead to severe toxicity, especially for young children. Therefore, option C (5mg/kg) is the most accurate answer as it falls within the range of the toxic dose for fluoride and is the closest approximation to the actual value.