Fluoride氟

Enamel defense

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牙釉质防线

Fluoride's main value is in the teeth, and the chemical mechanism is much more precise than the casual 'strengthens teeth' description.

Normal tooth enamel is hydroxyapatite Ca₁₀(PO₄)₆(OH)₂, which dissolves at pH < 5.5 (acid attack) — the chemical root of caries.

With fluoride it becomes fluorapatite Ca₁₀(PO₄)₆F₂: F⁻ replaces OH⁻, the acid threshold drops to about pH 4.5, acid resistance improves, and the crystal is more stable.

The remineralization process: saliva Ca²⁺ + PO₄³⁻ + F⁻ continuously repair micro acid-attack damage. Without fluoride, repair is slow and cavities gradually grow; with fluoride, repair is fast and the new crystals are fluorapatite.

So 'fluoride promotes tooth remineralization' is genuinely true and has a clear chemical mechanism. Two corollaries are worth remembering: continuous contact matters more than single large doses — this is why toothpaste, mouthrinse, and fluoridated water (the 'small and often' model) work; and under-6 kids whose teeth are still mineralizing absorb the most systemic fluoride effect.

Common fluoride product concentrations (ppm F):

Kids toothpaste 500–1000; adult toothpaste 1000–1500High-concentration anti-caries toothpaste (prescription) 5000, for high-risk patientsFluoride mouthwash 230 (daily) to 900 (weekly)Professional fluoride varnish 22,600, applied twice a year at the dentist

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Fluoride氟

Enamel defense

Stop 1/5

牙釉质防线

Read story