Figure 1
From: Effect of pH of amine fluoride containing toothpastes on enamel remineralization in vitro
Polarization light microscopy of experimental lesions. Experimental caries-like lesions after treatment with fluoridated toothpaste at different pH levels. a) pH 4.1; the upper experimental window shows an interrupted band. b) pH 4.5; the upper experimental window shows single porosities. c) pH 5.1; the upper experimental window shows an inhomogeneous lesion. d) pH 6.9; no difference can be seen between the upper experimental window and the lower control window.