One of my teeth is longer than the other. (Maybe even slightly further forward?)

I would suggest that you see a dentist that can mock up lengthening the other tooth or teeth and see how you like that first-he can then block out the longer tooth so you can compare your options. Once you decide on the final smile design you can discuss the many options of treatment to get there. Good luck

Hi, first of all, I am assuming that the teeth and gums are healthy, if the tooth has recently moved into this position, there may be a gum or tooth issue. I would firstly recommend braces, it just seems like one tooth is a little out, you could have a brace on the front 6 teeth, on the inside, or outside, and it would probably just take a few months to correct. I would definitely do this, as differences in the symettry of the front two teeth are very obvious. A slightly crooked chin is hardly noticable as all! The other option is veneers, possibly two. There will definitely be some tooth reduction, which is why my first choice is the braces. I hope this helps! 

There are several options. The shorter tooth can be lengthened, the longer tooth can be shortened.  Discuss this with your dentist.  Your chin would become more obvious if the teeth are even.