Effect of low-level laser on the rate of tooth movement

Low-level laser therapy (LLLT) has been introduced in orthodontic procedures with its initial purpose to alleviate the pain after adjustment of the appliances and to enhance healing of the sore spot caused by appliance impingement. Recent studies have shown that LLLT may increase the differentiation and proliferation of the cells associated with bone remodeling machinery and therefore affect the rate of orthodontic tooth movement. The effects of LLLT in regards to orthodontic tooth movement have been controversial. This article reviews the previous studies on the biological effects of LLLT on orthodontic tooth movement in animals and human subjects, and thereby aims to set the optimal protocol to accelerate tooth movement in orthodontic avenue.