Teeth touch at gums but leave a gap towards the bottom? (Photos)

I've had braces for 2 years now and I'm supposed to be getting them off in a few months but what bothers me is the gap shown when i smile in between my two front teeth. My orthodontist says there's no way i can fix it and it is just the way my teeth are shaped. The teeth touch at the gums but still leave a gap towards the bottom because they are triangular shaped. I don't smile a lot because of this and i really want to get it fixed. Is there any way this can be fixed ?

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