Hi @Pommy8
AIs ( such as Letrazole) can impact bone density so it is important to have it monitored.
I had a bone density scan which showed osteopenia at age 63 so saw an endocrinologist who put me on weekly tablets of actonel.
He also said I should up my calcium intake in my diet ( gave me a list) and also to do weight bearing exercises.
It is also important to get any major dental work done behind you start any medication to improve bone density as there is a potential nasty complication if you have such work whilst on this medication ( whether it be a tablet or injection).
Take care.