National Dental Examining Board of Canada (NDEB) Practice Exam

Question: 1 / 400

GP may be softened or dissolved within a root canal by?

Water

Alcohol

Chlorhexidine

Xylene

Xylene is the correct answer because it is a solvent commonly used in endodontic procedures to soften or dissolve gutta-percha (GP). Water, alcohol, and chlorhexidine are not effective in softening or dissolving GP. Water has a tendency to cause GP to swell and become harder, while alcohol is not strong enough to dissolve GP. Chlorhexidine can delay the dissolution of GP, but is not suitable for completely dissolving it. Therefore, the most appropriate option is Xylene.

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