While Fluoride increases bone mass, too much results in increased brittleness of bone and thus promotes fractures, however a certain amount is needed - about 4% as calcium fluoride - to harden bone. Silicon, usually taken in the form of Silica, is a natural trace mineral remedy that helps in the prevention of osteoporosis, and it is also especially helpful after fractures. This is in contrast to using calcium, which when high, will actually slow the union process. It is not unusual to see patients, whose problem fractures only heal properly after discontinuing calcium supplements... Full Text