Follow these steps:

Brush your teeth and gum two times daily. Use a soft brush not hard one. Brush morning and night before going to bed

After brushing your teeth, use tongue brush. According to a study, 90 % of the cause of mouth odour is due to bacteria in your tongue. Don't use your brush for the tongue.

Afterwards, use a tongue scraper which scrapes and removes the bacteria in your mouth.

Lastly, use a non-alcohol mouthwash that is anti-balerial and contains fluoride. Follow the direction of use. Don't swallow it. Rinse all your mouth and gargle to your throat. Don't swallow. Let it be in your mouth for about 30 seconds then spit it out. Use it in the morning and in the evening when you are about to go to bed.

In the afternoon, while at work, chew sugar-free gum (chewing gum that has no sugar).

Be consistent, it will eventually go. However, if symptoms does not go, see your dentist.

Try the above. It will definitely go. Also check YouTube videos on how to brush with tooth brush and tongue brush and how to use tongue scraper and mouthwash.

..lmao