[BC] AM detection in teeth/fillings

[wpio]

I agreed to speak 10 minutes to to a senior club of about 
200 next Tuesday.

They want a shirt sleeve explanation of how radio works, but 
  specifically asked me to tell what is known (truth or 
fiction) about people reporting that they "hear" radio when 
living near big AM stations.

I think it is this the phenomenon whereby the dental amalgam 
metal is acting like a crystal in teeth?

Are the teeth then making a vibration producing audio, or is 
it a nerve transfer of the detected audio into other nerves, 
mimicking sound?

Anyone who can refer me to an explanation, Thanks!