Let’s talk about this.
The way that a microwave oven works is that it sets up a standing wave in the oven that ocillates something like 20 million times a second. Water molecules which are weakly charge try to line up with the wave and so are constantly turning back and forth. This creates friction then heat, and the end story is your lunch. Microwave safe objects just don’t have any water.
Now microwave technology and RF technology for hair removal work on a very different concept. The idea was that an RF or microwave field would be created within the skin and that energy would be absorbed by structures within that field. The more dense the structure, the more absorption. Hair is the densest structure in the skin so it would absorb the most energy and hence would be selectively destroyed. The theory is not psuedoscience. Of course, the question is whether it translates to reality.
In fact, based on that theory and our desire to explore every technology to really tell what works or not, I purchased a microwave device ($50K) from Microwave Technology to test. Did it kind of work? Yes. Was it consistent? No. Did it have problems? Yes. The effect seemed to be only a generalized heat effect and not really able to destroy hair effectively. I haven’t entirely given up on the science but right now it is a dead end. And it cost me $50K to find this out. But that was the cost of learning.
The RF is based on the same theory. I had significant doubts because unipolor RF is used in Thermage at much higher settings and didn’t seem to have any effect on hair but this was bipolar RF, so maybe it could work. So we borrowed a machine from the manufacturer and tested it. The results were negative. We actually did side by side comparisons with an alexandrite.
So for example, we treated a man’s back of the neck who had mixed black and white hair. On the alex side, he had practically no remaining black hairs but plenty of white hairs. On the RF side, he had a mix of black and white hair. In other words, the alex did a good job of removing the black hairs, the RF did an OK job of removing the black hairs, and neither did much with the white hair. This pattern was repeated over and over again.
And by the way, everyone said that the RF machine hurt a hell of a lot more.
Now why do you need it to be associated with a laser or IPL? Hmmm.
If I were cynical, I would say so that there is at least some result. But the reason from the company (and this has been discussed as theoretical consideration) is that the RF and laser pulse preheat the target, making the subsequent treatment more effective.