Will my gap close? (photo)

I have had brace for almost a year and I only have 2 or 3 more visits left before I can take my braces off.My orthodontist says the gap in my two front teeth won't close.And the dumb thing is, isn't braces suppose to close up every gap?!He said it had to do with the shape, which is total BS because my teeth shape is fine.I told him it's because one of my front tooth is twisted. But he doesn't think it's the case. So is it possible that my gap can close? Or not?