Category “invisalign”

I have been using invisalign braces since Oct 2010, and had 10 sets of braces up to August 2011. I then had a further 5 sets of braces because my upper arch was still not aligned. I returned to my dentist at the end of Oct 2011, but the tooth next to my front tooth was still not in line with my arch ( it used to overlap behind my front tooth, it no longer does but is still behind the arch line of my upper teeth). My dentist told me Invisalign has refused further treatment as they have “reached their goal”. I argued that our goal was an aligned upper arch but my dentist just repeated the above. He then put a liquid emanel on top of the tooth to bring it in line with my front tooth and arch. I have had this since Oct 2011, but am not happy with it. The colour is more yellow than my own teeth, and I feel that my treatment is not complete, and not in line with what my dentist said was achievable. I asked if it was a money issue but he did not answer. Please can you advise me what to do – I am due to see my dentist in 2 weeks to have the final part of the treatment – a metal wire at the back of my upper teeth to prevent movement of my teeth back. I don’t see the point of doing this when my teeth are not fully aligned and why do I have to have liquid enamel put over a perfectly healthy tooth ( I have also been told that this discolours easily and needs replacing yearly).
I appreciate any advice you can give.
Many thanks