There is a little metal showing on my dental crown. Is there any fix for this? (photo)

You have a crown that has a  metal coping and porcelain covering it.  The porcelain was probably thin due to the lack of space available for the crown.  It is only an aesthetic issue and functionally it will be fine.  Should you ever have another crown  make sure to request that it be "metal free."  Good luck. 

Sounds like not enough tooth structure was reduced when preparing for the new crown so to fit the new crown into place, the dentist removed the porcelain down to the metal. If it bothers you aesthetically, return to the dentist and have him redo it. Suggest an all porcelain zirconium crown which has no metal base and looks much nicer.

Your dentist appears to have ordered for you a crown with a nickel substructure covered with porcelain to make it look like a tooth.  Not enough of the tooth was removed from the chewing surface to allow for the thickness of metal and porcelain, forcing the lab to make the crown too big for the space.  The dentist then ground down the crown exposing the metal.  Though the metal showing does not endanger the tooth, if you want to replace the crown you may be able to remove it yourself without drilling by biting into sticky Milk Duds.  Then have the tooth shortened a little more where the metal shows through and have the dentist order you a full contour zirconium oxide crown which will need no metal layer underneath.