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"The permanent government now is the anchorpeople. They don't get elected, and year after year they're responding emotionally to this or that."
- Kurt Vonnegut, Jr.

Dental Switchboard  
  A control device tied in with teeth and nerve endings.  

This device provides a hands-free way to control other devices; in this case, a set of body modifications. In the novel, Gully Foyle seeks revenge on those who abandoned him in space; he has his entire body rewired for greater strength and speed.

He pressed hard with his tongue against his right upper first molar. The operation that had transformed half his body into an electronic machine, had located the control switchboard in his teeth. Foyle pressed a tooth with his tongue and the peripheral cells of his retina were excited into emitting a soft light. He looked down two pale beams at the corpse of a man...
From The Stars My Destination, by Alfred Bester.
Published by Berkley in 1956
Additional resources -

I can't find this as an assistive device for people who are unable to use ordinary controllers (like people with high spinal injuries); I wonder if it is worth exploring. An interesting use of computers as an assistive device is found in this article Spinal Cord Injury and how to live with it. It describes a mouse-substitute that can be operated with lips and tongue alone. Left and right mouse clicks are done by sipping from or puffing into the "hollow joystick."

It would be handy for athletes; here's a bit more:

Every nerve plexus had been rewired, microscopic transistors and transformers had been buried in muscle and bone...

Foyle touched his tongue to the switchboard wired into the nerve endings of his teeth. He accelerated...

He backed a step and pressed his tongue against his upper incisors. Neural circuits buzzed and every sense and response in his body was accelerated by a factor of five.

Compare to the Ullran enunciator from Uller Uprising (1952) by H. Beam Piper.

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Additional resources:
  More Ideas and Technology from The Stars My Destination
  More Ideas and Technology by Alfred Bester
  Tech news articles related to The Stars My Destination
  Tech news articles related to works by Alfred Bester

Dental Switchboard-related news articles:
  - Tongue Controller Uses Tongue Magnets
  - Tongue Drive System Validated In Clinical Trial
  - iLickit App Reveals iPhone Tongue Interface
  - Intraoral Tongue Drive System
  - Tongue Mouse Created By Valve Engineer

Articles related to Input Device
Tongue Mouse Created By Valve Engineer
Skinput Uses Your Skin As An Input Device
AcceleGlove Open-Source Data Glove
Roomba Detects Emotions Like HAL-9000

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