And never use mouthwash without rinsing and spitting several (six or more ) times afterwards, even a tiny amount of mouthwash swallowed can upset you gut bacteria. That is probably the main reason some people need probiotics in the first place.

I buy and gobble down probiotics when I have tummy troubles, but for the most part, as long as I have a fairly balanced diet plus a good dollop of yogurt in my bowl of fruit for breakfast, I do pretty well without supplements. Glad to have them when my gut gets somehow out of balance every once in a while though.