Invisalign for Top Teeth Only?

As long as straightening your top teeth does not worsen your bite it may be fine to treat only the upper arch.  Often, however, it is not possible to treat just one arch because doing so makes the bite "uncoordinated' and problems may result from this.  Also, getting the bite correct actually helps the teeth stay straight, so it may pay in the long run to correct both arches.  To find out if any of these points apply to your case you should visit an orthodontist for a consultation.

Technically, it’s possible but it’s not a good idea. The problem is that, when you alter one ‘arch’ of your teeth (in this case, the upper), the lower will almost certainly then not match. This is likely to cause more problems in the long run and, as it doesn’t cost that much to do both arches, your orthodontist will probably recommend doing both.

It is possible to treat only one arch although certain movements may not be able to be done without doing both arches.  While it is possible your dentist who would be doing the invisalign should be able to tell you for sure.  To be honest it is going to be the same cost whether you do one arch or both so it would probably be better to do both arches.  Hope this helps