SilentSpeller is a dental retainer with 124 sensors that lets people spell out words on a screen using their tongues.

The device was developed by researchers at the Association for Computing Machinery’s special interest group called The Special Interest Group on Computer–Human Interaction (AMC SIGCHI).

Watch the video above to see how the device works.

Follow the ACM SIGCHI page on YouTube to keep up to date on the latest news in the field of computing machinery.