This is a common problem that is easy to deal with.
Bad breath starts at the back of the mouth, where sulfur-producing bacteria hide under the surface of the tongue.
Irregular hygiene, food between the teeth and caries all contribute to the development of bad breath.

Other, less common causes include:
• Dry mouth (xerostomia), which causes less saliva to be produced in the mouth.
• Gastrointestinal problems where stomach bacteria create odors
• Big dietary changes (like ketosis) where your body breaks down fat and you can smell it on your breath.
Either way, good dental care will keep your breath fresh for a long time, so let's take a look at how to do it:
Brushing your teeth for fresh breath
• Brush your teeth for at least 3 minutes 2 times a day.
• Change your toothbrush once every 3 months.
• Choose toothpaste with fluoride.
Many people stop at brushing their teeth, but there are several other important steps you can take to maintain oral health and eliminate odor:
• Bacteria and food particles “hide” in a thin layer on the tongue. Make sure you brush your tongue and teeth well.
• Use dental floss between your teeth.
• Try a dual-toothbrush for a thorough clean. The bristles reach deep between your teeth, while the cleansers gently remove bacteria from the inside of your cheeks.
• Finish cleaning with a refreshing rinse.
• Reduce your coffee consumption.
• If you smoke, try to reduce or quit completely.
• Drink plenty of water: it stimulates the production of saliva.
• Limit alcohol consumption.
Earlier, Russians were told why chocolate makes people happier.