Sure they can be fixed. When my brother was younger, his 2nd set of teeth grew back in like that. An oral surgeon cut the space between the gums out and then banded the two front teeth together forcing it to heal with the teeth growing together.
Funny, but a space between the teeth makes you wonder why a person doesn't do anything, yet, a nail or screw put through someone's tongue makes sense? *giggles
"Who is this doing this synthetic type of Alpha Beta psychedelic funkin'?" CHEMICAL BROTHERS