This process occurs in two stages. The first stage is called bone resorption. Cells called osteoclasts become active on the bone surface and dissolve bone tissue, creating a cavity. The second stage is bone formation. Other cells, called osteoblasts, fill the cavity with new bone.
Osteoporosis is a result of an imbalance between bone resorption and bone formation.
Osteoporosis can be treated. In childhood, new bone is added faster than old bone is removed so that your bones become larger and denser as you grow. Adolescence is the most important bone building period. As teenagers, after reaching full height, our bones can become more dense. Calcium and physical activity are important to bone health.