Yes. I'd do it, and do it now.
I had orthodontistry when I was a kid; my overbite was so bad that when I smiled, all you could see was my upper gum. I would have eventually lost a bunch of teeth. Health problems were an issue. Take care of your health.
Your comments on timing are true. Balancing a series of serious oral and dental procedures with a grad student's hectic schedule would be difficult. I've been to grad school. Believe me, you don't want distractions. If you've got spare time now, do it now.
Finally, looks are important. I wish it wasn't so, but they are People type and classify other people by appearance all the time. A person with a correctable physical issue, like bad teeth, may be presumed to be from a lower-class background and thus less well-educated and so on. At the very least, it raises questions: why haven't you been able to have it fixed? And you don't want to go into a job interview raising questions by your very appearance.
I don't mean to be harsh -- I don't think I'm being harsh -- but it's a tough world out there, not much different than high school. If you don't look like one of the pack, the pack may not be interested in asking you to join.
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