Hello , I have twin blocks (for overbite) which my orthodontist gave to me 9 months ago , I have worn them up until now with no issues but a few days ago the bottom one split in half (I have been piecing it together and using it still) how much would it cost for me to get it fixed? (UK) or could it just be fixed with something for free by the orthodontist (with the NHS) the thing is , I only have these on for the next two weeks (need my jaw to move 3 more mm) will this be possible with the split ? Before I get my fixed metal braces on the 25th January