Can a Cavity Cause Bad Taste in Mouth?

"A bad taste in the mouth every so often is normal. It can be caused by eating a strong-tasting food, drinking alcohol, or experiencing everyday oral health issues.

"However, when a person is unable to get rid of the taste by rinsing and brushing, it may be wise to see a doctor or dentist. They can determine the underlying cause."

https://www.medicalnewstoday.com/articles/321438.php