Tooth enamel mineral phase (chiefly Hydroxyapatite and Fluorapatite)

Tooth enamel resistance to acid denotes the capacity of the outer tooth layer (enamel) to withstand demineralization when exposed to acidic conditions, such as those produced by oral bacteria metabolizing sugars[5]. This resistance is fundamentally governed by the enamel’s mineral content, predominantly hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂), which can be transformed into fluorapatite (Ca₁₀(PO₄)₆F₂) upon fluoride exposure, markedly improving acid resistance[4][5]. Therapeutic strategies (e.g., fluoride treatment, application of remineralizing agents like nano-hydroxyapatite or calcium phosphate) seek to enhance this resistance by increasing the supply of mineral ions or modifying enamel microstructure[1][4]. While enamel acid resistance is a desirable property, it is not a discrete therapeutic target, but rather a composite result of biological mineralization processes and exogenous treatments.

Other names

Tooth acid resistanceenamel acid resistanceacid-resistant enamel

Fluoride ions replace hydroxyl groups in hydroxyapatite, forming fluorapatite, which is less soluble and more acid-resistant[4] Remineralizing agents supply calcium and phosphate ions, promoting enamel repair and resistance to future acid attacks[1]