Not convinced
I've had two "contact free" procedures. One involved a laser up my nose (don't ask). That hurt like hell. The other involved very high frequency radio in my mouth. That was the single most painful experience of my life - all whilst the dentist was eulogising "see, it doesn't hurt a bit does it? It's amazing this thing". I was in pain for several days afterwards but unable to protest at the time due to having a large radio transmitter and the dentists hands in my mouth along with a decent quantity of bleach.
"Contact free" might be cheaper and require less training - but in my (admittedly, rather limited) experience that certainly doesn't mean pain free.


