Should I Correct my 4 Mm Overjet Using Invisalign?

Invisalign is not a good appliance for correcting excess overjet. Traditional braces are better but still not the best way to correct excessive overjet. The only way to correct excessive overjet predictably and without damaging the TMJ is either surgically or with functional orthopedic appliances. 

Great question, good luck! 

A 4mm overjet can be a warning sign of another developing problem.  You have to ask the question of why this has occurred.  Did you have expansion of your upper jaw with your treatment?  Has your tongue posture been looked at?  Are you getting clicking in your jaws?  Headaches?  Are your upper teeth moving forward or your lower jaw receding?  Once you answer these questions you will be closer to an answer about treatment and know how to proceed.  If you are saying that the previous result was good with a normal 1-2mm overjet and now you have 4mm OJ, then the likely change is do to your lower jaw moving back and could lead to TMJ dysfunction (headaches, clicking jaw, etc).  If your front teeth are more protrusive, it may be do to an anterior tongue thrust.  Answer these questions and you can then decide on a sensible treatment approach.  Good luck!

I dont think aliners would reduce the 4mm if braced didnt. I would go back to your Dr and see if he has some other option for your case. sometimes when cases are retreated they respond better and your might be a case like that