Only one study compared different types of lasers (InGaAlP and GaAlAs), wavelength (660, 810, 980, and 1064 nm), and power (100 mW and 0.25 W) on the healing of mucositis by evaluating the expression of platelet-derived growth factor (PDGF), transforming growth factor beta (TGF-β) and blood-derived fibroblast growth factor (bFGF) in an animal model. Here, FGF2 is linked to mucositis.