While the groin, nose and hands are known as germ magnets, there is one part of the body that gets dirtier than all others. According to a recent study published in the Public Library of Science, the belly button is home to more than 2,300 different bacteria. It's hidden, warm and moist—perfect conditions for bacterial growth. It's especially a problem for people who are overweight or who have piercings in their navel.
The mouth is also a hotbed for odor-causing bacteria. There are hundreds of different types of bacteria living in the mouth at any given moment, and they produce acids that dissolve teeth, infect gums, cause cavities, and more. That's why it's important to brush and floss regularly.
Nails are another area that tends to get dirty more easily than other parts of the body. They are made of a hardened form of dead skin, and they catch a lot of dirt, dust and other debris, particularly when we walk barefoot or do household chores. Those who don't clean their nails often are prone to infections in the fingernails and the skin underneath them.
The armpits are another place that can smell bad if they are not properly cleaned and cared for. They have many sweat glands that create a lot of moisture. The skin under the arms is thicker and more fatty than the rest of the skin, which makes it more susceptible to infection and abrasion. People who shave their armpits regularly are less likely to have problems with them.