| If she smokes it is probably serious, if she smokes a lot its probably nicotine sticking to an unwashed tongue.
if she has black spot on her tongue sounds like she has poor mouth hygeine and if you saw them they are probably bothering her and she asked you to look, right ? That is really gross.
Okay, tell her to brush her tongue, it hurts, but it may help, gargle with an antispectic mouth wash, or 3% peroxide (l part peroxide to three parts water), or if that doesnt sound good to you two, then salt water, teaspoon to two parts water. She has to keep it in her mouth for at least a minute. See if all this helps then if the black spots dont go away she has to see a dental hygeinist. good luck. | 
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