Bad breath is a common problem that could affect anyone, and while it is generally just unpleasant it may also reveal a more serious health problem.
According to the NHS, around one in four people in the UK suffer from it on a regular basis, and in these cases it is known as halitosis.
Foul smelling breath is usually down to poor oral hygiene, such as not brushing at least twice a day and flossing regularly.
This allows bacteria to build up in your mouth, and toxins are produced which affect the smell.
From a fishy smell to the scent of rotting flesh,certain types of bad breath can point to different types of health problems, according to Dr Harold Katz, developer of the The Breath Company.
Kidney and liver problems
A fishy smelling breath could mean you have a kidney or liver problem.
“Nitrogen is the main culprit when it comes to giving out fishy smells,” said Dr Katz.
“That means that if your breath has a distinct fishy odour it might mean your kidneys or liver are to blame.
“This is because of the inclusion of nitrogen in the breakdown of kidney and liver tissue.”
He recommended that if you notice a fishy smell on your breath, you should see your GP as soon as possible.