Hello
It is because ur mouth is a dark and warm place which is the perfect environment for bacteria to grow and survive. It doesn’t matter if u brush it really well on ur tounge there and groves in ur tounge where the toothbrush bristles cannot reach and clean so that is where the bacteria lives.
Hope this helps
Plz mark me as Brainliest
Btw science and biology are almost the same thing
Dinoflagellates is the algal divison.
