D..
Yes, it works. Choose a reputable place. Since it's your face, you really should consider using a dermatologist office rather than just anyone. It may cost a litte more, but it's worth it in case of breaking out that can and does occur. It happened to me when I had my legs done, and she had the doctor come in and take a look and prescribe me medicine.
Sometimes they have a BOGO (buy one get one) and you can get your underarms done. I didn't care about having it, but it was free, so hey, I did it. I found that I LOVED it. The dark shadow from the hairs under the skin disappears forever. It's wonderful.
It does cost hundreds of dollars because you have to do it for a while, but it's worth it if you can afford to do it.
Dawn