Selam aleykum sis,

I really don't know, but why not wait until you can call your Sheikh?

I understand the reason your sis gave, but one could counter that.
Some see widening the teeth gap as beautification, and that's haram too of course. So then in those cases, if you reduce the gap you're trying to become more modest so to say...

But the gap seems to distress you and make you feel a bit different I guess, ('cause you say you've always wanted) and a gap could possibly, easily attract unwanted attention.

Maybe this will help? http://www.islamonline.net/servlet/S...=1119503543166