Various methods have been adopted to reduce orthodontic treatment time. These include biological approaches using vitamin D and prostaglandins; relaxin cytokines that include lymphocytes and monocytes-derived factors, receptor activator of nuclear factor kappa B ligand (RANKL), etc.; surgical methods such as corticotomy, piezocision, interseptal alveolar surgery, osteotomy, etc.; and noninvasive device-assisted methods such as mechanical vibration, photobiomodulation, etc. The biological and surgical approaches although more predictable have their own limitations of acceptance by patients. The present study, therefore, is a narrative review literature on the noninvasive methods to accelerate orthodontic tooth movement. A review of 56 articles related to the studies, using noninvasive methods, was done from 1987 to 2019. Photobiomodulation is one of the most studied noninvasive methods and has shown success in reducing the treatment time. More research is needed to make these methods more accessible and patient friendly.
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