While the name might sound clinical, the reality is anything but. From mesmerizing ASMR lip syncs to jaw-dropping beatbox battles and bizarre "mouth only" acting challenges, this niche has exploded into a full-blown cultural phenomenon. But why are millions of viewers transfixed by the human mouth? And how did this become a cornerstone of trending content algorithms?

As with any niche that zooms in on the body, mouth compilations walk a fine line.