Toothpastes that contain zinc
BMJ Group Medical Reference
Some toothpastes are advertised as helping to get rid of bad breath. They may contain a mineral called zinc. Zinc has many roles in your body, including keeping your immune system healthy. The immune system is your body's defence system against infection. Zinc may also work by neutralising sulphur-containing chemicals that can make your breath smell bad.
We can't say for sure whether toothpastes that contain zinc help with bad breath. There hasn't been much research to find out.
We did find one study carried out by researchers from a toothpaste manufacturer.  The study found that bad breath improved more for people who used a zinc toothpaste, compared with people who used a normal toothpaste. After using the toothpaste for four weeks, the benefits seemed to last up to 12 hours after brushing.
Your immune system is made up of the parts of your body that fight infection. When bacteria or viruses get into your body, it's your immune system that kills them. Antibodies and white blood cells are part of your immune system. They travel in your blood and attack bacteria, viruses and other things that could damage your body.
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