Can Invisalign Fix my Slanted Front Teeth? (photo)

You have what we call "bimaxillary protrusion" which basically means that both upper and lower anterior teeth slant forward.  To correct this you need tilt the front teeth back toward the tongue and, to do this, you need space!  Now you could get space by moving both arches backward toward the wisdom tooth area, but this is almost impossible to do.  You could get some room by doing slenderizing (narrowing) your teeth but this only provides a small amount of correction.  To get what you need probably involves extracting one middle tooth in all four arches.  Possible but very difficult with Invisalign...braces are often a better bet

Invisalign can improve some of the forward position of your teeth by creating slight spaces in between the teeth to allow them to be pulled back. If you are looking for a significant change then extraction might be required since that would allow for much more room for the teeth. Expender would not be used or helpful in this kind of situation.
 

The key problem is lack of arch width.  It would be interesting to know if you ever had braces before.  It would have been best if your bones were encouraged to grow with the use of braces.  It is still possible to get arch width, but the best way to do it is with fixed appliances (braces).  You can get braces that affix tot he inside of the teeth and are totally invisible - these are called lingual braces.  Invisalign is not able to increase arch width as the forces are not able to biologically encourage the bone to widen.