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Similar thing happened to my mate and his sister when we were teenagers. They had gone to some expensive private orthodontist who decided they both needed absolutely everything doing, removing a bunch of teeth, the works. Their mum got a second opinion a bit later and it turned out almost all of it was unneccessary so she sued them and they settled out of court for a massive amount of money. The orthodontist is still there today.
Sumo
stevo_com
This guy was my childhood dentist, still having his work corrected at the age of 39. Maybe one of my many fillings were ever actually necessary.
https://www.belfasttelegraph.co.uk/incoming/review-urged-into-dentist-scandal-28114921.html
http://news.bbc.co.uk/2/hi/uk_news/northern_ireland/6126298.stm
https://www.youtube.com/watch?v=sp-NIDP9wwI
Oddly, I'm not scared or anxious about dentists as a result. Maybe because I'm just so fucked off by the whole thing. Like it has desensitised me.