Does Invisalign Work to Shorten Bottom Front Teeth? If So, How?

It is less predictable to intrude teeth with Invisalign® than with braces, but it CAN be done.  It likely will take much longer to do it this way, but if you are determined to use Invisalign® then do it.

Wires and brackets can quickly get the needed forces to create the room for your restorations, so a consultation with an orthodontist or experienced general dentist should help.

Intrusion is done by putting pressure on the top of the 4 teeth with the aligners and they will sink into the bone. The gum line will follow them and it will look great. The teeth will NOT be smaller looking when you are done with treatment so dont think they will.

The situation you are describing is fairly common.  In order to have well made and properly contoured crowns on the upper front teeth (whether supported by implants or natural teeth) it is essential or at least helpful to have lower teeth properly positioned.  Although Invisalign is a great system for moving front teeth, research has shown one of it's limitations is moving teeth in the up or down directions.  Although it is feasible to some extent is more predictable and efficient to just use regular braces in this situation.  The good thing is though, that for most people lower braces will not show when you smile.  A consult with a qualified orthodontist will help determine the best way to approach this.

Good luck!