The causes of oral malodor are mostly caused by oral hygiene and gastrointestinal problems.

I suggest you check whether it is a dental problem first, which may be caused by dental calculus. I suggest you brush your teeth regularly and maintain good oral hygiene.

If there are problems such as tooth decay or residual roots, they need to be solved in time.

If there is nothing wrong with your teeth, you can go to the gastroenterology department to see if there is any gastrointestinal problem.