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Early childhood caries risk management — ORE Part 1 MCQ

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HardPaediatric DentistryEarly childhood caries risk managementORE Part 1

A 2-year-old child has white spot lesions on the maxillary incisors and sleeps with a bottle containing sweetened milk. The parent brushes once daily with a smear of low-fluoride toothpaste. There is no cavitation yet and the child has no pain. Which is the correct physiological explanation for the development of these lesions?

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Correct answer: E — Frequent nocturnal sugar exposure sustains plaque acid attack when salivary flow and buffering capacity are reduced during sleep

Option E is correct. White spot lesions represent early non-cavitated caries—enamel demineralisation caused by prolonged plaque acid exposure. The 2-year-old's nightly bottle habit with sweetened milk provides continuous fermentable substrate for cariogenic bacteria (Streptococcus mutans). During sleep, salivary flow dramatically decreases, eliminating saliva's protective buffering, cleansing, and antimicrobial functions. This combination—frequent sugar + reduced salivary protection—sustains an acidic environment that demineralises enamel subsurface, creating white spots. Option D is wrong: primary enamel is not immune to acid; subsurface demineralisation is the mechanism of white spot formation. Option B is wrong: lactose in milk is fermentable by plaque bacteria and produces acid; milk does not prevent bacterial metabolism. Option A is wrong: once-daily low-fluoride brushing cannot counteract the cariogenic load from continuous nocturnal sugar exposure; diet modification is essential. Option C is wrong: white spots are superficial enamel lesions, not pulpal pathology. This is established in UK (SDCEP) and international guidance on early childhood caries pathophysiology.

Reference: SDCEP (2025) Prevention and Management of Dental Caries in Children – guidance update; Nursing bottle caries literature consensus (PubMed 279552, 2025 PMC12840144, 2017 PMC5708267). https://pubmed.ncbi.nlm.nih.gov/279552/