His evidence was his experience he had with his patients on the different osteoporosis drugs. His comments were only on dental health. He did not offer any osteoporosis advice. As @windyshores said, " Dentists are going to protect dental status and bone doctors are going to protect bones!" Just one solution is not for everyone. Many things to consider. No right or wrong, just a difficult decision after a person has considered all of the 'facts'.