PTH and osteoporosis: Parathyroid hormone is a major endocrine regulator of mineral ion homoeostasis in extracellular calcium and phosphate levels.51 Continuous PTH exposure results in catabolic effects, while intermittent exposure is associated with anabolic effects.52 Thus, intermittent PTH (1‐34) (teriparatide) treatment has been used for the treatment of osteoporosis.53, 54 Moreover, researchers also found that intermittent treatment of PTH can prevent the progression of knee or spine osteoarthritis,31, 32 but not much is known about the specific function of PTH administration in TMJ OA.