What causes bad breath? How can I prevent it? - Smile Exchange
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There are few things that can turn our stomachs like talking to someone with bad breath.  Luckily, in many cases, bad breath can be prevented.

Bad breath can be caused by a multitude of factors. Bacteria growth, food particles, smoking, poor dental hygiene, halitosis, dry mouth, respiratory infections and gastrointestinal issues such as acid reflux are just some of the causes of bad breath.

Fortunately, there are many different options to help prevent and remediate bad breath.  First and foremost is good oral hygiene. Brushing and flossing regularly, as well as using an antiseptic mouth wash will keep food particles and bacteria from collecting in your mouth. Make sure to use a tongue scraper to get any bacteria off your tongue as well. And, of course, visit your dentist regularly to have your teeth examined and cleaned by a professional.

In addition, chewing sugar-free gum after a meal can help keep your breath fresh and smelling good.

If you have a dental condition like halitosis or dry mouth, your dentist can recommend specific treatments to aid in symptom relief. And, if you have acid reflux, talk to your primary care doctor. If they can identify and fix the cause, your bad breath may go away.

Source: https://www.colgate.com/en-us/oral-health/conditions/bad-breath/what-causes-bad-breath-0114