string: Almost all previous histologic studies have shown that LLLT not only may affect the speed of dental movements, but also influences remodeling in the tissues surrounding the teeth and, consequently, results in formation of new bone of a higher quality and speeds up the remodeling of collagen fibers, which in turn might affect the short-term stability of the dental movements.(13,15,17,24,25,28,29,37) Our findings are also consistent with this theory.