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Hi Maimee - MN local editor for Buckinghamshire here.
If you haven't found anywhere yet, take a look at the listings on here. We've just added details of all dentists within the county, so hopefully you'll be able to find somewhere suitable within your area.
The new site is just up and running, so go ahead and explore, it will soon be full of useful info, special offers for MNetters, and lots of local chatter!