INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the most common side effect of nitrous oxide?

Headache
Dizziness
Nausea
Dry mouth

The correct answer is: Nausea

Nausea is the most common side effect of nitrous oxide, with around one third of patients experiencing this symptom. While headaches, dizziness, and dry mouth can also occur as side effects, they are less common than nausea. Headaches are more likely to occur if the nitrous oxide is administered in high concentrations, and dizziness can be caused by changes in blood pressure. Dry mouth can also be a side effect, but it can be managed by drinking water before and after the procedure. Therefore, while all of the options listed may be side effects of nitrous oxide, nausea is the most common and likely to occur.