I had my two front bottom teeth fitted with crowns years ago, at least a decade, can't remember exactly but closer to 12 years ago. Anyway one of them has worn down to metal, so I now have a big dark spot of it showing through right at the front of my mouth. My gums underneath are also grey, dentist says this is from the metal leaching into them?
Didn't know crowns didn't last, or that the metal could leach into your gums!
Anyway my dentist said they can't do anything as I'm an NHS treatment, if I wanted them sorted I will have to go private as it's cosmetic. Am so self conscious I'm considering it but what sort of costs am I looking at? Is it going to be hundreds? 
Gah DS has just started crying - I will try to check back later for replies. Would appreciate any advice at all.
Current dentist is not the one who fitted the crowns BTW.
Oh and I grind my teeth, think that's not helped. Meant to wear a mouth guard at night but it hurts. Got given it a couple of months ago.