It is not usual for a dental crown to smell post-treatment. Sometimes metal crowns or porcelain-fused-to-metal crowns emit metal ions which can lead to a foul taste.  We recommend booking in a schedule of routine appointments with your dentist at Wimpole Street Dental Clinic so we have the opportunity to regularly assess the current condition of your dental crown once fitted. If you do notice any foreign or unusual smells in the weeks following your dental crown, report it to your dentist and you may be referred to our hygienist for a thorough clean.