if you had to have them removed, it would probably be done at the hospital anyway so no charge :)
there are only 3 nhs charges now - around 16:50 for a check up (including xrays and basic scale and polish)
around 45 pounds for any number of fillings+ root canal
Around 191 pounds for anything that involves lab work ie dentures or crown etc. If you need1+2 you only pay the fee for 2. If you need 1 2 and 3 you only pay the fee for 3.
If you are on a low income and on certain benefits, everything is free anyway.