(Original post by Vohamanah)
I don't think you have a case regarding the bottom teeth. He asked you if you wanted it and you declined consent. While legally he could have taken your mother's consent, in practice no orthodontist is going to forcibly fit a bottom brace to a child who is refusing to have it fitted. He could hardly pin you down and force it in your mouth.
Understandably, you are now saying that if he had fully explained the reason for the bottom brace you would have consented. But from the POV of a legal claim the burden of proof would be on you to show that:
1) He didn't provide you with enough information to make a fully informed decision on consent (this would also include any leaflets he gave you about the procedure, which I find they tend to throw at you like candy so they can show they've "explained everything", even if they haven't actually said a word about it;
2) If he had provided you with that information you wuold have consented. And this is without the benefit of hindsight. I.e. would the 14 year old girl in the chair have consented to a procedure which she knew would cause more pain to teeth that my her own admission were already straight. I'm not doubting you would have, but the burden would be on you to prove that, which will not be easy. Consent claims are never easy.
I don't have very much information on the other work done, such as whether the cement was put on incorrectly (It sounds like it was supposed to stay in the mouth for at least the duration of the brace, but I'm not sure how much is still left when you say there is "some still on your teeth" - if it is a small amount and its not doing any harm its probably reasonable), whether the retainer was measured correctly, whether the orthodontal treatment is responsible for your lisp and the current cosmetic defects and whether these are recognised complications of having a brace in the first place.
Your case sounds quite complicated, to be honest. There might be something there, there might not. You have three years to bring a clinical negligence claim, which, as you were a minor when you had the treatment, will run from your 18th birthday (i.e. expires when you hit 21). I'm not sure how old you are, but that will obviously dictate what you do.
In the first instance I would suggest making a complaint. Sometimes an explanation of what went wrong is enough. In rare occassions they may even agree to redo the work. If you're not happy following that its probably worth looking into making a claim if you wanted to.
With regards to funding I'd suggest asking your parents (if you live with them) to check their insurance policies for any legal expenses insurance, which might cover the costs of a claim. If not, check if you're entitled to legal aid. There's a means test (how much your household income is) plus a merits test. My gut instinct is that you would fail the merits test, because they demand quite a high chance of a succesful claim, but its worth applying if you meet the means test.
If that's also a no, you might be able to get a solicitor to take it on a conditional fee agreement (I.e. no win no fee) but be VERY careful what you're signing up to. Some will expect you to pay expenses, which can range from a few hundred to a thousand pounds plus. They're not scams, but make sure you know exactly what you are signing yourself up to and in what circumstances you would be liable to pay for anything. You could either try one of the claims management companies (the "have you had an accident?" ones you see on TV), but bear in mind their panel firm may be some way away from you. That's probably not a problem at this stage, but if you want to see someone face to face you might want to start with the Law Society's Find a Solicitor tool on their website to look for a local firm instead.
Also worth a mention, if you are still under 18 you would to bring a claim via a responsible adult (usually a parent) as your 'Litigation Friend'. They would sign any legal proceedings on your behalf and probably deal with most of the claim for you.
Whatever you do, good luck. Feel free to PM me if any questions. Bear in mind that anything I've said is purely on a very brief look at the facts and of course nothing should be held to be binding legal advice. I'm not acting for you, just giving you my thoughts.