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What is the cause of a bad taste in my mouth?

I am a 22-year-old male and almost every day I have a bad taste in my mouth. I brush my teeth twice a day. What is the cause of a bad taste in my mouth?

3 Answers

Many issues:

1) Leaking filling
2) Decayed tooth
3) Periodontal disease
4) Sinus infection with a postnasal drip

Have your dentist check out your mouth asap.
The cause of the taste could be your diet, i.e., garlic onion coming from your stomach. It could also be a result of periodontal disease. Go see a dentist.
A bad taste in the mouth could be the result of a single tooth infection that is going unnoticed or is asymptomatic. Otherwise it could be a systemic issue in which case it is better to see your primary care doctor to make sure you don't have any conditions that would otherwise have a manifestation in the mouth. Lastly it can be as simple as not flossing regularly and the food in between your teeth is not being removed and causing bad breath.