What’s that coat of white and yellow stuff on top of the tongue that gives bad breath called?

Bacteria

Dose the orabrush work on a white tongue?

i have white tongue which causes really bad breath, i heard about the orabrush and was wondering it it works for my condition?

You can use the orabrush at anytime.You must know that the solution of your problem is not resolved by orabrush.You must take an effort to maintain dental hygiene: brush your teeth at least twice a day.And go for medical check up too because the cause of bad breath does not come only in dental aspects,sometimes,it is triggered by pulmonary disease too.So,check your health by trying to go to the medical doctors for health consultations.God bless!