Should I get an implant or braces?

I'm 18 and I have a gap between my front teeth which wasn't much of a problem until I was 16.I fractured my 2 front teeth, one broke in half and the other cracked, so the dentist did tooth bonding for me, but there was something black inside the tooth which was very disturbing. I ignored it for a while but then I noticed that it's getting loose and is rotting at the back. So I'm not sure if I should continue with this tooth and get braces or get an implant because I am tired of this gap.