How Do I Get Rid of the Odor from the Gap Between the Ceramic Caps and the Gum Line?

The odor comes from food getting caught between teeth.  May be you have an open contact thats when teeth don't touch or floss goes in freely. I would either change crowns if that's the case or at least see your dentist 

 

 

 

 

If you already had Xrays done and your dentist says the crowns are well cemented then the bad odor should not exist. I recommend mouthwash and waterpick (water floss) just after the floss, brush and mouthwash, once a day at nights. the waterfloss makes a big difference.