Question Anyone's tongue ever turn black?

[Ianw58]

I had a bout of "Black Tongue" a few years ago. It turned out to be interaction with the bacteria on my tongue and the hydrogen peroxide in my mouthwash. There may be peroxide in your toothpaste. Try a different paste and see what happens.

 

[Searcaigh]

Yea.
Um. The regulator or the hose?

There could be mould in your second stage if it's been unused for some time and stored without drying it out properly.

Sanitising your mouthpiece also helps after dives