I can't really say for sure. My buildup is so minimal that I can only guess that small layers/pieces of it are coming off by itself when I brush my teeth. My buildup no longer gets to a certain point before it appears like it is going to fall off in one big chunk.
Best of all, the elasticity of my lips is returning. I just smiled really wide & even stretched out my lips with my tongue and no cracking "plasticky" feel occurred. My lips also no longer feel raw & sticky.
I really hope my progress continues. I am trying really hard to follow Sargvy's method even though I am practically in a cell wearing shackles at my job.