The definition of hair trimming seems to be different for some hairdressers than it is for you. With the hair dusting method you get rid of your dead points, without your hair getting shorter.
Hairdresser Sal Salcedo introduces the world to the hair dusting technique, a method in which the dead ends are cut without your hair becoming shorter.
Read also: 'Now you have to:trim your own points and/or cut your bangs'
He makes a strand of hair as smooth as possible, clamps it between his fingers and slowly cuts away the protruding hairs. The disadvantage is that this way of cutting is very time consuming.
Source:Refinery29