Puttaravuttiporn P, et al. - This randomized control trial was performed to measure the changes in tooth mobility, alveolar bone, and receptor activator of nuclear factor kappa-B ligand (RANKL)/osteoprotegerin (OPG) in the gingival crevicular fluid (GCF) during orthodontic treatment to regain incisal function in the presence and absence of biting exercises. The authors found a significant increase in bone thickness by the biting exercises but no effect was observed on tooth mobility, bone height, or density. The RANKL/OPG ratio reduced 1 month after treatment (T2) and associated with increased bone thickness.