Thanks for your message, if you are unhappy with the treatment you have received, I would always recommend that you return to the dentist who has carried out the treatment to inform them. I am sure that if you explain your concerns, the dentist will be able to either advise you of why this is and reassure you, or make arrangements for the crown to be replaced. It is possible that the crown you have had fitted may be metal based for strength. However without seeing it, it is ipossible to say for sure. I hope that this will be of some assistance to you.

Regards