1, put your hands together to cover your nose and mouth at the same time, and then exhale. At this time, you can smell the smell in your mouth, and you can judge whether there is bad breath according to the smell.

The easiest way to know if you have bad breath is to find someone close to you and ask them directly.

3. You can also choose to lick the back of your hand gently with your tongue, and then put your nose close to the licked back to smell the taste. If there is a bad smell, it is bad breath.

4, in addition to licking the back of your hand, if you feel a little disgusting, you can also use other items to test, such as plastic spoons, the method is basically the same as licking the back of your hand, licking the plastic spoon to smell.

If you feel uncertain, it is the most authoritative method to find a professional dentist to judge. Doctors can judge whether there is bad breath by directly measuring the nose, which is also a relatively easy and accurate method. The degree of halitosis can be judged by scoring quantification.

References:

Baidu encyclopedia-halitosis