Dr Joe Pelerin from Michigan said that stress is responsible for much of the night-time grinding his patients experience.
However, this can cause damage to teeth, receding gums and root canals, as well as migraines.
He recommended using a mouth guard such as GrindGuardN – which releases the stimulus for clenching teeth – to reduce grinding activity by up to 70 per cent.
Dr Pelerin said even such a simple measure can change lives "in dramatic ways".
The Bruxism Association – which provides information for people who grind their teeth at night – can also offer advice on mouth guards that are approved by the British Dental Health Foundation.