Hey, my friend noticed i had a yellow coat of i don't know what on my tongue, it is in the back region of my mouth(yellow,brownish kind of pasty & not really thick).I have researched, i need further information. Following things i do: smoke, drink coffee, drink tea,whitening mouth wash and i also eat a lot of spicy things( i can take alot of tobasco)? What are the causes? Is there anything i should worry about. Thank you for your help.
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