I don't really know for sure when it all started. I have been analizing pictures of when i was a kid, and i looked pretty symmetrical. I think my asymmetry started at around 13 or so, it wasn't that noticeable though. When i really took notice was after braces. I didn't get full braces, back then what really bothered me was that my teeth were so crowded that one of my canines stuck out a lot. I got braces to get it down, and that's all that the braces did. I had them for 6 months only. My front two teeth still overlap a little, like they used to.
I remember my dentist telling me to close my mouth after taking the braces off, i closed it, and had to slide my jaw a little to the left so my teeth fit together.
After the braces (i was 20) i noticed i looked really crooked. I thought it had been the braces. But as i analized pictures of me before that, i found that i was already asymmetric, starting at around 13 or 14 and progressively more noticeable as the years have gone by.
What i do know is that people used to tell me i was cute way more often before the braces, my face did change a little bit.
I don't know what shape my arch is, but i have noticed that my molars are rotated inward (the upper right ones and the lower left ones), i don't know if that's got anything to do with it all.
In your case, was there any good reason to make your arch into a V shape? it sounds irresponsible on your dentist part, knowing as how it affected your face muscles and all.
I think that my dentist was irresponsible with me cause she didn't tell me anything was wrong with my bite... i was happy to get my canine down for a very inexpensive price though.