One of the things I hate about it the most, the new toothbrush that is, is that it has a raised, braille-like pattern on the back of the brush head, presumably for raking debris and bacteria off your tongue. This annoying feature is not only handy for preventing halitosis, but is equally advantageous for scraping the inside of your cheeks into a soft fleshy pulp as you brush. Yaaay.
Moreover, the mechanical humming too closely resembles the drills that orthodontists use. Honestly, if I wanted to reenact the sensation of going to the loathed, depressive, suicide-inducing dentist, I would just book an appointment, or submerge my balls in a vat of boiling oil. I'm just saying, no me gusta el dentista.