Can I get bad breath from not brushing?

Romesh Nalliah
Indeed! Not brushing can create numerous problems and one of these is bad breath. If you do not regularly brush away the bacteria, as they decompose they start to form a bad smell in your mouth and can lead to other problems like gingivitis, periodontitis and cavities.
Not brushing your teeth can be a cause of bad breath, an unpleasant condition that can be cause for embarrassment. If you don't brush and floss daily, particles of food remain in the mouth, collecting bacteria, which can cause bad breath. Food that collects between the teeth, on the tongue and around the gums can rot, leaving an unpleasant odor. Some people with bad breath aren’t even aware there’s a problem. If you’re concerned about bad breath, see your dentist. He or she can help identify the cause and, if it’s due to an oral condition, develop a treatment plan to help eliminate it.

Brush twice a day with fluoride toothpaste to remove food debris and plaque. Brush your tongue, too. Once a day, use floss to clean between teeth.
Joan Haizlip, MSN
Cardiology (Cardiovascular Disease)
Yes, not brushing your teeth is one of the biggest culprits of bad breath. It's important to brush your teeth after each meal and floss between your teeth. Halitosis can be caused by rotting food that gets stuck in your mouth if you don’t brush after meals. So by brushing your teeth, you are practicing good oral hygiene. This will help prevent halitosis and keep your teeth healthy.
When you don't brush and floss you leave particles of food and also bacteria which  cause bad breath. When food trapped between your teeth and gums and left on your tongue rots, it produces an unpleasant odor. The same happens when you don't properly clean dentures.

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