Davin Lim, MBBS, FACD - Account Suspended says:OK, most of us would use RF at a conservative depth, depending on the area targeted. 2-3 mm, fat lies deeper in most areas, however on your forehead for example, I normally would use a 0.5 mm setting. Now here is the catch- if someone does not know what they are doing, and uses the 5 mm needle ...