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an electric toothbrush is much like an acoustic toothbrush, except that instead of a sound hole, it contains a small piezo pickup and a 2.5mm output jack for amplification or recording
active electric toothbrushes are, for some reason, the most prominent on the market, but seasoned brushers like me prefer the passive electric toothbrush, for its lighter and much less bulky form
many brushers may wonder why we don't simply place a mic in front of the mouth. this does work, but it picks up a lot of undesirable mouth sounds, and the mic doesn't enjoy the liquid projectiles