How effective is Caci microcurrent in firming up the skin?

The short answer to this is that a CACI microcurrent facial to tighten up the muscles is a waste of your resources. I would seek a reputable facial rejuvenation specialist and get their opinion. The bottom line is while many of these treatments sound appealing because of the minimal downtime, they have limited effectiveness and more importantly are just a waste of someone's time and resources. A reputable facial rejuvenation specialist will be able to steer you in the right direction. Good luck with your research.

Dear antiageingdiaries,
Thank you for your question. Microcurrents only have a very mild effect in firming and this is short lived. If you want more than this and better value for money, I would suggest looking into alternative treatments before commiting to an expensive course of microcurrents.  The most effective treatment for tightening up the jawline is a face and necklift. There are several non-surgical techniques with better success rates than microcurrents if you are not ready for this yet - laser, skin peels, RF. Consult with a board certified plastic surgeon in your area who also provides non surgical facial rejuvenation treatments.
I hope this was useful and good luck with your research.
Best wishes