PDO threads can be divided into three categories:
PDO mono threads. Smooth sutures that help rejuvenate your skin by stimulating collagen production.
PDO cog threads. These threads have barbs that latch into your skin like small fishhooks, to provide support and lift parts of your face.
PDO screw threads. Made up of one or two intertwined threads, these are used to help restore volume to sunken parts of your skin.