Many fad diets cause “”hunger breath””, due to not eating any carbohydrates. When the body starts to break down fats, the resultant release of ketones causes bad breath. Try drinking pure orange juice at mid-morning and mid-afternoon, and eat a slice of bread at lunch, to ensure you consume suficient carbohydrates.

Tongues that have a long central groove or large papillae are more susceptible to bad breath, as they tend to trap more bacteria and mouth compounds.

If you produce a lot of nasal mucus, you are also more susceptible.

Hormones control the concentration of saliva. When saliva is thicker, this causes bad breath. Some women notice breath changes related to their menstrual cycle.

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