You can see that the porcelain tooth replacement is really just a cheap nickel tooth covered in porcelain and not covered very well.

Its hard to tell just how orange it is based on the pic with flash.
I guess other people have had similar issues.

I am so tired of this tongue freakshow in my mouth. I wonder what causes it. Do I have some underlying fungal infection.? Am I allergic to the cheap metal in my tooth?
I wish I could just start my life over and ate no candy from the beginning.

I know this post is a couple of years old LoL I'm not sure if you ever solved your "orange tongue" problem, but I felt I should share my advice... This is actually Xerostomia, or severe dry mouth. I have the same problem from a medication I take so I never sweat. If you had your tooth replaced rather recently from this photo then it is more than likely caused from the procedure and since the metal is more exposed it has drying properties. The location of the tooth can't be replaced with only a porcelain tooth because it would break too easily since you always would chew with it. I do not think it to be a good job of the dentist having the metal center exposed, this seems to only be a fitting issue though, so it could be easily remedied with one return visit that should be free. If the Xerostomia continues then your solution would be drinking more water, sugar free hard candy or gum, or what I use and is a Godsend is a product that the company Biotene makes called Dry Mouth Gel. It is a minty gel you place on your tongue and apply to your gums evenly. It is amazing. Also, never use any mouth wash with alcohol and use a fluoride rinse such as Act. And buy a tongue scrapper. All of these can be found at any drugstore or grocery shop and are all less than $5. Hope you solved this issue already man I know how terrible it can be.
My goodness paul. Can you feel it on your tounge?
What were you eating? Maybe its not fungal infection... maybe its cheetos...
Maybe it's an allergy to the metal. It looks like allergy compounded by a fungal infection. Fungi are usually vivid crazy shades... but I am stumped on why you are getting the infection in the first place. Maybe it's an allergy -> inflammation -> loss of function -> infection -> orange tongue cycle.
Have you ever had this orange tongue or geographic tongue symptoms BEFORE you got that nickel plated tooth?
I had all the metal ones removed in 1998. There were 11 of them. I had them replaced with the resin. They lasted a good 10+ years and some need to be refilled. Our insurance only covers metal fillings in back teeth according the my dentist. I said I would just pay the $300 to get the resin ones. Anyways, this was a different problem. I was told the cavity could not be filled and the tooth needed to be sawn off and replaced by a porcelain crown. What I thought was a porcelain crown turned out to be filled with metal. I can see the nickel colored metal at the gumline and it has a nasty metal taste. I think at this point it might be impossible to remove it without loosing the roots.
Did you get the poly-resin filling? I had several cavities as a kid and sometimes they get bad again. I have them filled with poly-resin which takes a while to harden but I don't think it uses any metal. From what I understand it bonds better with your tooth too.
I hope your mouth/tongue/teeth get better fast. Stuff that would drive me crazy.