As you know petite women are more prone to osteoporosis, but also, they believe, the dexa is inaccurate for the petite boned and makes the numbers look worse than they are.
So you ask how worried you should be, I would say, not that worried really. I would do the dental thing before the drugs. I would take time and get educated on all your options before taking a drug.
Once you start you get into the drug loop. Make sure you understand step 2 before taking step 1.
But that is just me. As they say "You do You".