I was advised to have a bridge in my teens because my canine didn't grow down. I have had the current one for approx 25 years. I now have a grey look above the bridge.
Am I Entitled to a New Bridge on the NHS if My Old One is Turning Grey?
Doctor Answers 2
Entitlement to a new bridge
I'm assuming NHS stands for National Health Service? What country are you in? I'm familiar with US, and we do not have a National Health Service. Here, the bridge would have to be failing for some other reason than puely cosmetics. Perhaps the margins of the bridge are leaking or causing periodontal disease?