Can Invisalign Correct Two Straight Teeth That Are Not the Same Length?

If the length of teeth discrepency is from the position, Invisalign MIGHT be able to help, but it is more challenging than with traditional wires and brackets.  If the teeth are short from wear and tear, it might be better to make them longer, normally with porcelain veneers or crowns.

When you say you "want a nice smile" it is important to find a dentist that is trained in smile design to help guide you with your decision process.  It may be a simple case, and it may be more involved than you think for your desired outcome.

While you COULD extrude or intrude teeth using Invisalign, the most important question is SHOULD you? There are several variables to consider when deciding whether you should lengthen a short tooth, intrude a long one, or use cosmetic dentistry to resolve the discrepancy. Some of these include the length of the other teeth in the smile (the smile line), the positions of the gumline on the teeth in volved (since it will follow the tooth if you move it up and down), and the condition of the teeth involved (worn or broken). It is also important to consider what you will do to maintain the position of the tooth if you choose to move it orthodontically. Whether it is moved up or down, it always tends to move back in the direction it came from unless retained in some way. Building up the worn or broken edge of a short tooth with cosmetic dentistry may give a much faster, more stable result than braces or Invisalign (and I'm an orthodontist who loves moving teeth!). Good luck!

It all depends on why the tooth looks short!

Although Invisalign has a harder time extruding (lengthening) a tooth, if needed it can be done.  Often, however, a short tooth is just short and is better handled by the dentist with a buildup or veneer