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.

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

Various views of a terminator like vintage dental manikin

Rubber head dental manikin

Showa University third generation dental robot

Dental Training Chair Mount

Dental Mankin which appears to be shouting

Translucent Dental Mankin

Dental Phantom with Steel Gums and Teeth c.1930

College Dental Simulation Lab

Pain Girl robotic dental and medical simulator

Rubber Dental Mannequin with Human Jaw & Dentures

Phantom Head, antique dental school trainer

Dental Manikin—Lightweight and Compact Economy Type Simulator