I had a crown fitted yesterday , over a post. Upper right molar. The dentist had to drill away some of the crown , to enable a good fit with my crown below. He also had to drill away some of the crown below as well. It feels good, but, when my husband looked in my mouth, he could see a silver/black post in the middle of the tooth. We are assuming it's the post. Its about 4mm long. Is that normal, as there is no mark like that on my other crowns that have a post in them?