Re-Hardening Effect of Two-Applications of Combined Fluoride-Laser on Incipient-Enamel Lesions

Liu et al. [1] explained the possible cariostatic mechanisms of the combined fluoride-laser treatment. They suggested that a laser-induced purification of the human enamel hydroxy apatite structure takes place and plays the major role in this cariostatic process. They also mentioned that the low-energy laser treatment has a photo thermal effect that may cause a reduction in enamel permeability. They also reported an increase in the fluoride uptake by the enamel surface in the form of calcium fluoride. And subsequently, in the presence of fluoride and laser treatment a transformation of hydroxy apatite into “fluoro apatite” takes place, which is more resistant to acid attacks.