Question) Does taking oral probiotics help with bad breath?

There are many causes of bad breath,

Lately, even when I brush my teeth, I feel like my breath is still bad. I have rhinitis, so I open my mouth often and my mouth is dry. Would taking oral probiotics help to some extent? There are so many different types of oral probiotics these days.

I drink two liters of water and gargle often, but it's not easy to manage.