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Bad breath affects over 2.5 million people in the UK, and that only includes the people who've gone to the doctors about it. All of us get it from time-to-time but for others it can be a big problem.

A study by the British Dental Health Foundation discovered that 1 in 5 of us think that our partner has bad breath and 42% of us think that a friend or colleague has it.

But what causes it? Well the smell itself is caused by bacteria on the tongue, but certain things can make it worse.

We've got five common reasons for bad breath as well as top tips on how to beat it from our expert, Leigh Greenwood from the British Dental Health Foundation.

We've also got a bad breath test to find out if you suffer from it.

Read on: What effect can food have on your breath?

Where next?
- Get more on bad breath from our health pages
- Improve your dental health with our expert guide
- Expert advice on getting rid of bad breath

By Vicky Woollaston

• Next: Causes of bad breath: Food

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