I got a permanent porcelain crown on tuesday. I've been having on and off pain when I chew and today I noticed a fracture line near the gum line. My dentist isn't in until Tuesday, so the other dentist that was available saw me today. He said that I should just put in baking soda and de-sensitizing toothpaste. He said that I did not need a replacement. What can I do so that it doesn't hurt. Can it be filled with something?