At what age do prepubertal hormonal changes typically BEGIN in girls, producing the exaggerated gingival inflammatory response seen clinically?

Correct answer: C. 9–10 years

• A. 6–7 years is the start of the mixed dentition — the eruption of the first permanent molars and incisors — not the onset of puberty.
• B. 15–16 years is late adolescence, by which time the exaggerated hormonal gingival response is usually subsiding.
• C. CORRECT. In girls the first endocrine changes of puberty begin at roughly 9–10 years, several years before menarche. Rising oestrogen and progesterone increase gingival vascular permeability and favour Prevotella intermedia, which substitutes for vitamin K in bacterial growth. The result is PUBERTY-ASSOCIATED GINGIVITIS: florid, bleeding, oedematous interdental papillae that are grossly out of proportion to the amount of plaque present.
• D. 12–14 years is well into puberty for most girls; the gingival changes are already established by then. Boys typically begin around this age.

Note: The tissue response is hormonally AMPLIFIED, not hormonally CAUSED — plaque is still the aetiology. Treatment is therefore meticulous oral hygiene and scaling, not hormonal intervention. The same mechanism explains pregnancy gingivitis and the pyogenic granuloma of pregnancy.