What is the dirtiest part of a man's body?

　　1. Scalp

　　Studies have found that there are about 1 million microorganisms per square centimeter of scalp, and the largest number of them is lipid mites. They like to make their homes in the epidermis of the scalp, and join together in small groups to form a "big family". They work together to make a living by sucking the lipids secreted by sebaceous glands. The final result is hair loss。

　　Countermeasures: If you want to fight them, in addition to washing your hair frequently, it is best to comb your hair with a comb every morning and evening, which can stimulate the scalp and allow it to ventilate.

　　2. Oral cavity

　　The oral cavity is where food must pass, but did you know that there are more than 100 million microorganisms per square centimeter in our oral cavity, including good flora and a considerable number of bad microorganisms, which are the main culprits of bad breath. They live between teeth and on the tongue, producing unpleasant-smelling sulfur compounds while breaking down food particles and saliva.

　　Countermeasures: Keep your mouth clean and hygienic, brush your teeth carefully in the morning and evening, remember to floss between your teeth before brushing, and clean your tongue after brushing. The bacteria remaining on the tongue will also damage your breath.

　　3. Armpit

　　In a crowded bus or subway, you may have experienced that unbearable smell more than once! It emanates from your armpits and pollutes the surrounding air unscrupulously. The number of microorganisms hidden in armpits is as high as 1 billion to 10 billion per square centimeter. Sweat itself has no odor, it is a "frequent visitor" to the armpits, and the rod-shaped bacteria are skin The secreted fatty acids nourish and breed a large number of bacteria, thus producing an unpleasant odor.

　　Countermeasures: Armpit sweating is not disease , as long as you bathe frequently and change clothes frequently, it can be eliminated. It is best to choose cotton clothes for underwear.

　　4. Intestine

　　There are more than 400 species of bacteria living in the intestines. Escherichia coli in the intestines is a good guest in the body's inn, helping us with digestion and being an integral part of our defense system. But Escherichia coli outside the intestinal tract can cause disease. If it "slips" into food, it may cause nausea, vomiting and diarrhea。

　　Countermeasures: To protect the intestines, it is recommended to drink 1-2 bottles of yogurt every day. The probiotics in it can inhibit the bad bacteria from dominating the intestines and help the good bacteria gain control over the intestines. Also, stick to moderation exercise , often do push-ups, abdominal rubs, etc. to prevent intestinal aging.