Both osteoporosis and periodontitis are characterized by bone resorption. Osteoporosis is defined as a generalized disease of the skeleton affecting bone microarchitecture and density and conferring a predisposition to fractures, including fractures of the upper end of the femur. Periodontitis is characterized by gingival inflammation and destruction of the alveolar bone, potentially leading to tooth mobility and loss. Both these diseases are common health concerns associated with a considerable economic and societal burden worldwide. The prevention of these two diseases is therefore a real public health issue. The close association between osteoporosis and periodontitis should lead dental surgeons to refer patients with severe periodontitis to a rheumatologist for an assessment of bone density. Conversely, patients with osteoporosis should undergo regular oral check-ups to prevent tooth loss and maintain good oral health.