Introduction: Studies have been reported that with the application of low level laser therapy, inflammation around root was decreased, bone regeneration and tooth movement was accelerated, which may have great benefit in reducing root resorption. The aim of this study was to test the hypothesis, that the low level laser therapy decreases root resorption secondary to the application of orthodontic forces in an apical direction. Materials and Methods: This study was designed to test the efficacy of GaAlAs laser irradiation on 10 patients. Apically directed force of 25 grams was delivered by using cantilever springs. Laser irradiation was applied on the mucosa at 6 points around the first premolar on the experimental side. Laser irradiation was started on the day ‘0’ after inserting intrusion spring and was repeated on 7th, 14th and 21st day and teeth were extracted on 28th day after taking photographs and impressions. Root resorption craters on the buccal and palatal surfaces were recorded using a scanning electron microscope. Results: Compared with the control side, the mean resorbed root surface area of the experimental side was less and it was statistically significant (p = 0.040). Conclusion: Under the limitations of the present study, it can be concluded that GaAlAs irradiation together with apically directed forces led to reduction in the amount of root resorption on experimental side compared to control side and can be used as an adjunct to reduce the root resorption.