Formic Acid in Human Single-Site Resting Plaque – Quantitative and Qualitative Aspects

Formic acid was the most prominent acid in resting plaque. The mean acid concentrations for formic, acetic, lactic and propionic acids were 8.18, 5.75, 1.66 and 0.4 nmol/mg wet weight, respectively. There were no statistically significant differences between the acid content of plaques from molars and anterior teeth nor between buccal and lingual sites.