I have had

I have had two veneers fitted next to my two front teeth for the past four years, half of my veneer has come off and this is the second time it has happened on the same tooth over the past year and a half. I went to the dentist to see If I could get it replaced and was told by the receptionist it would be £209 to be done, I then had my check-up and was advised by the rude dentist that it would cost me £340 as I could not get it on the NHS as it was cosmetic work, which I can not afford to pay. My tooth has been very painful and I am finding it difficult to eat, am I entitled to having it done on the NHS as I am experiencing pain or will I have to pay the full private amount?