So what has the dentist suggested you do next about these abnormalities?
If you have something lined up already, like going for some tests or something, then you have to tell yourself that you cannot do anything right now. Worrying about it will only maintain your health anxiety - and if you want to overcome it, this is not helping. So tell yourself that worrying about it is not going to help and you have done all you can possibly do for now. So try and let it go and in the meantime, try and relax and work towards overcoming your anxiety.
This is the only advice I can give you. I know this is easier said than done - and if I was in your position, I would most likely also be panicking constantly about it. But this won't help you.
One tip I find works for me is this: you cannot stop yourself from worrying - especially if your mind jumps to the worse case scenario - I always do it. However, you can control that anxiety. What I mean by this is you can have those worrying thoughts but not allow those thoughts to get ahead of you. And in some respect, you have to let the worry run its course. Allow it to happen and analyse it. Think about how you feel. Think about the kind of thoughts you are having - log them. Then try and rationalise them. Challenge them. Look at them from someone else's perceptive. Ask yourself, "If I didn't have health anxiety, what would I think of these thoughts?" or even, "If I didn't have health anxiety, what would I think about the abnormalities… would I think they are cancer?" etc. and this may start to help.
But the least thing you want to do is merely sit there and allow the worry to get ahead of you and interfere with your life.
I hope this helps your worries - I really feel for your worries and I hope you can get better.