That's an obsolete method. If you hear that term, run. Do not let them touch your hair. What you want are 'long layers'. "Thinning" causes your hair to be shredded, choppy, frizzy, with thin ratty ends.
3B, bra-strap length
laidback, very-modified CGer
HG: GF Sleek 'n Shine Leave-in; Alagio