The condition known as burning mouth syndrome is difficult to diagnose because there are no visible signs of the problem, which used to be called glossodynia. Along with a new name, there are now more treatment options including antidepressants which appear to damp down the chronic pain patients experience. Antidepressants are also used to treat this condition, although they can become less effective over time. Some patients are offered surgery to relieve this if other treatments don't work. Dr Anna Donald, who's an expert in medical evidence, sifts through research on mouth ulcers and cold sores to offer advice on what really works.
Some patients report chipped teeth and headaches because they grind their teeth in their sleep.
Connie St Louis hopes a new device supplied by her dentist will stop her from gritting her teeth - giving her, and her husband, a peaceful night's sleep.