I had root resorption in my lower front teeth. Dentist told me the cause of this is not known, but it is thought that past orthodontic treat or minor injuries as a child, might cause it. I think mine were probably caused by long term orthodontic treatment, a gum graft in that area as a young adult, and severe gum recession. I don't believe the idea of the minor injuries as a child causing root resorption later in life - that sounds ridiculous to me. I had my bottom 4 front teeth removed due to root resorption, and two implants placed with an implant bridge between the two implants. The dentist explained that the resorption is caused when the cells in the tooth root that usually clear out dead cells and other cellular debris begin to attack and destroy the normal root cells. The root is destroyed from the inside, and the tooth enamel thins and becomes brittle, and the tooth will eventually break off. It may be more of an autoimmune condition. This doesn't seem like it would be related to osteoporosis. Also, anytime you do not have teeth rooted in the jaw bone, you will naturally have bone loss in the jaw. My jaw bone should stay strong around the implants, but I will naturally have bone loss under the bridge.