What do you need to know about PDO thread lift?

In general, PDO threads can be divided into floating, non-barbed threads, and barbed threads. These can be further sub-classified in several ways:

PDO Threads
Non-Barbed	Barbed
Mono-filament threads	Unilateral vs bilateral
Braided threads	Uni-directional vs bi-directional vs z-type
	Cutting barbs vs molding barbs