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Thanks for responses lilacben & MrXLA - psycologically I'd feel better having a tooth at the back and being a veggie I chew on my food quite well ( not quite chewing the cud, but along those lines!) I think that if I just leave it , it is only a matter of time before the filling in the tooth falls out ( not much left to hold it in now )
I like white crowns as then I can still convince thje kids to clean their teeth really well, and they will "be as perfect as mine" - not quite as convincing with a mouth full of metalwork!