From my understanding, clear acv has little effect. The cloudy acv with "mother" is what helps. If you suspect candida as the cause of your white tongue (rather than bacteria) while acv might help to some degree, using it alone might not be enough. Usually, there are many more symptoms than just a whitish tongue, though many don't realize they are all interconnected. Suggest looking at other candida symptoms and considering a full candida protocol.

Blessings.

ACV, which I have been only using for the last week everyday religiously (one teaspoon in water 3 times a day), has seemed to clear my tongue really well. I agree with Candi - I use Braggs Raw ACV. (It is only like 4 bucks - one of the cheapest things I have tried so far!)
I also agree with Candi that you need to do a comprehensive program - diet, probiotics, and antifungal - to get at the root cause of what is wrong. There are a lot out there - do your own research to decide which one sounds best to you. (There are a lot of options listed on candidadiet.com). I use one by Jordan Rubin - my tongue back months ago was so furry, it was hard to swallow -disgusting. Primal Defense, coconut oil, and a low-carb, Weston Pricey diet has gotten my candida under enough control that I only had a thin coating.
But the ACV has seemed to make my tongue almost pink in a weeks time- so if your main concern is just your tongue and bad breath, I would definately try Braggs ACV!

You might as well clean your mouth properly. Use a mouthwash. If that didn't work, then, consult a doctor.