Chlorhexidine Role in Perio — ORE Part 1 MCQ
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Correct answer: C — It is used short-term as an adjunct when plaque removal is temporarily difficult
**A is correct.** Mechanical plaque removal by toothbrushing and interdental cleaning is central to periodontal care. Chlorhexidine mouthwash has a limited, adjunctive role when effective mechanical cleaning is temporarily compromised—for example, following periodontal surgery or when pain limits brushing. UK SDCEP guidance describes 0.2% chlorhexidine as short-term treatment, generally no longer than 14 days. **B** is wrong because chlorhexidine does not treat periodontitis as primary therapy. **C** is wrong because it cannot replace daily mechanical plaque control. **D** is wrong because it has a defined short-term role. **E** is too restrictive: postoperative use is one indication, but it may also be used in other situations where mechanical plaque removal is difficult.
Reference: Scottish Dental Clinical Effectiveness Programme (SDCEP), Prevention and Treatment of Periodontal Diseases in Primary Care: Oral hygiene aids, 2026. https://www.periodontalcare.sdcep.org.uk/guidance/treatment-components/managing-risk-factors/oral-hygiene/oral-hygiene-aids/