Journal of AdvancedMedical and Dental Sciences Research

Oral cavity hosts for a variety of microorganisms, among them Streptococcus mutans that is commonly present in environment is considered as one of the major etiological factors. Their exceeding high number and their ability to produce acids post degradation of carbohydrates and induce a tolerance to low level pH environments makes the teeth vulnerable for cavity. There are many proposed ways to kill the bacteria one such proposed method is uses of lasers thus the aim of this study was to evaluate the bactericidal effects of omega diode laser on S. mutans with intervals exposed time. S. mutans isolated from patients with high caries risk were exposed to different interval time (10, 20 and 30 s) and then swabbed to the rabbit teeth. The bactericidal effect was shown in the exposure time of 20 and 30 s without any curiosity sign on the rabbit teeth, the caries sign appeared on the low time exposed (10 s). Therefore, a diode laser can eliminate the S. mutans when irradiated above 10 s.