By http://www.bbc.co.uk - An invention which cancels out the noise of a dentist's drill could help people overcome their fear of a check-up, researchers say.
This new device allows patients to listen to music on an MP3 player, while the sound of the drill is blanked out.
Patients are, though, still able to hear the dentist's voice because not all sounds are filtered out.
Poetstechnieken op LookingforDental.com