Can I increase posterior molar teeth height to counteract a short face/mild recessed jaw?

It is possible to open vertical in some patients.  In others it would be a disaster.You would ideally ge placed on a ULF TENS to relax your muscles and have a computerizd Mandibular Scan to evaluate physioloogical space from rest to occlusion.  You do not want to decrease freeway space too much.Check ICCMO.org to find a doctor using this  technology.

Yes, that is possible through orthodontic treatment to extrude posteriors. I advise visiting an orthodontist to check cephalometric values and how much correction is required and whether is it possible through brace treatment.

Hello and thank you for your great question.In some case opening the bite works great, in some not so much. Each case should be checked by a doctor experienced in extensive cases. Please remember for it to work, EVERYtooth will need to be crowned or veneered.All the best to you.

Some people would take to something like what you're talking about with no problem. A lot of people would have an issue in their jaw joint if this was attempted. What we do prior to affecting the height of back teeth is make a mouthguard to wear that will be the height of crowns if we did them, have the patient wear it for a few months and see how well they tolerate it.