These synthetic heads don't need to be anywhere near the Uncanny Valley to be terrifying. Our friends at Oobject have assembled 12 of the creepiest prosthetic mouths in dentistry.

Also check out these creepy medical mannequins, 12 videos of automata, and a dozen crash test dummies.

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Various views of a terminator like vintage dental manikin

Rubber head dental manikin

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Showa University third generation dental robot

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Dental Training Chair Mount

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Dental Mankin which appears to be shouting

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Translucent Dental Mankin

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Dental Phantom with Steel Gums and Teeth c.1930

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College Dental Simulation Lab

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Pain Girl robotic dental and medical simulator

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Rubber Dental Mannequin with Human Jaw & Dentures

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Phantom Head, antique dental school trainer

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Dental Manikin—Lightweight and Compact Economy Type Simulator