Canadian scientists have developed a device that allows people to generate electricity and store it through jaw movement when talking or eating  The subjects chewed gum for 60 seconds after wearing the device  The cord close to the chin generated about 10 to 18 microwatts of electricity, while each chewing during meals produced an average of about 7 microwatts
The newly developed power generation method can be used to charge hearing aids.
 It is expected that this improved power generation method may be used to charge small electronic devices such as hearing aids, intelligent hearing protectors and even mobile phones in the future