Tali, like Olive said, you can get that one tooth bleached. The dentist will drill a hole in the back of the tooth (no needle as the tooth is already root filled!), insert the bleach and put a temporary filling in it. You usually need a couple of changes to the bleach (quick and easy appointments) and when you're happy with the shade the dentist puts a permanent filling in. I worked as a dental nurse years ago and I can't remember the cost, but I know it wasn't terribly expensive. Some people get a better result than others to the bleach, but you should definitely see some improvement. If you are still not happy with the appearance you could consider a composite or porcelain veneer for the tooth. I'd definitely try the bleaching first though! You definitely made the right decision keeping the tooth and having the root canal - extractions can lead to all sorts of dramas, particularly front teeth!!