Should I get Invisalign or a veneer for my left lateral incisor? (Photo)

You would benefit from aligning the teeth properly with Invisalign.  Although sometimes it is possible to correct alignment issues with veneers, in your case, the lateral tooth is positioned too far lingually.  Also, there are other teeth that can be repositioned so you will get a much better result with Invisalign.

Thank you for posting your question and photos.  The tooth you are referring to seems to be positioned to far back from your other teeth.  Invisalign will help to align this tooth and the other teeth that are misaligned.  Once the tooth is in a better position then a veneer can change the shape of the tooth. Since your 23 you have to think what is the best long term solution that will make you happy.     

Being embarrassed to smile is a serious problem and can negatively affect social interactions.  I wish there was a quick fix for you.  But it looks like you need orthodontic treatment, possibly Invisalign to correct your bite and straighten your teeth. I don't think a veneer would work for you.   Looking at your pictures, it looks like your one upper lateral is pushed in and I suspect sits behind your lower tooth when you close.  Also the gums on that tooth are pulled down lower than the rest of your gum line.  A veneer on this tooth would be very short because it would be low on the top due to your pulled down gum line and short in the bottom edge to clear your lower tooth when you close.  If you were curious what a veneer would look like, you could ask a dentist to do a nice bonding for you. A bonding could be placed without any damage to your tooth, so if you didn't like it, you could ask it to be taken off.  Once you saw what could be achieved, with a quick fix, you might feel more decisive about which option to choose.  Most dentists would charge to do a bonding even if temporary, but I suspect if you decided to go with Invisalign instead, they just might give you partial or full credit toward Invisalign.  My best to you!

 If I understand your chief concern, you want to align your left lateral incisor with the adjacent teeth. It's hard to tell from the photos that you have an underbite,  more photos would help. That said, if you simply want to align the teeth in each arch and not address the underbite, Invisalign may work for you. A single veneer would not be your best option. Particularly if it would be built in an underbite situation.  Your top and bottom teeth could be aligned better, so Invisalign would help to accomplish that. If you want to try to correct the underbite, you should see an orthodontist to evaluate what all your options are.

It's good that you understand that you have more dental problems than just the misaligned lateral incisor.  A single veneer is not a good option to correct the misalignment and Invisalign can correct the misaligned lateral incisor but completely ignores more serious dental problems. Your underbite looks to be the result of a severely underdeveloped upper dental arch. Invisalign will NOT correct this problem. This problem is not only causing your chief concern (a misaligned lateral incisor) but is also causing a very narrow smile and potentially a sleep breathing disorder. Clearly, a sleep breathing disorder is more significant than a misaligned lateral incisor. I would highly recommend that you seek competent professional recommendations to fix your more important issues before spending resources to fix the misalignment of your lateral incisor. Good luck!