https://www.selleckchem.com/products/2-hydroxybenzylamine.html The CAT activity was elevated in proportion to the number of decayed teeth. The SOD activity showed a positive correlation with the frequency of tooth brushing. The activity of SOD, CAT and GPx was higher in boys than in girls. An inverse relationship between enzymatic antioxidant activity and age was also observed. Although enzymatic antioxidants had no positive correlation with DMFT/dmft, they were positively correlated with the number of decayed teeth and the improvement of oral hygiene. Although enzymatic antioxidants had no positive correlation with DMFT/dmft, they were positively correlated with the number of decayed teeth and the improvement of oral hygiene. The growth and proliferation of gingival fibroblasts are important in the process of oral wound healing, and photobiomodulation (PBM) might be able to modify this process. The aim of the current study was to evaluate the biomodulatory effect of a single session of laser PBM by means of 810 nm and 940 nm diode lasers alone and their combined application with different fluencies on human gingival fibroblasts (HGFs). Cells were provided by the Pasteur Institute, the National Cell Bank of Iran (NCBI) (C-165). Laser irradiation was carried out using 810 nm, 940 nm and 810 nm + 940 nm in the continuous wave (CW) mode, 100 mW, and energy densities of 0.5, 1.5 and 2.5 J/cm2. Cell viability was evaluated at 24 h with the MTT assay. Trypan blue staining was used to evaluate proliferation 24, 48 and 72 h after laser therapy. Propidium iodine was used to stain DNA and the cell nucleus. Laser irradiation (810 nm, 0.5 J/cm2) increased the viability of gingival fibroblasts, while this dose had an inhibitory effect wiation dose of 810 nm, 0.5 J/cm2, resulted in a positive effect on cell viability at 24 h, no statistically significant stimulatory effect on viability and proliferation was observed for the other single wavelength group. When a combination of the