I'm not a doctor but from what I know is that most white tongues are indications or canidida. Gargling with peroxide and water is a start,taking probiotics,and antifungals can help. If you have a dry mouth chwing Biotine Gum and using the mouthwash helps. Lots of times tonsilitis can be the root of the problem (googlgle it) Acv (Braggs with water) is very helpful with tonsilities and taking antihistimines for post nasal drip is good because that is where the tonsilitis comes from. Look up Oil of Oreagano and orher antifungals that may be helpful for this.Poor diet also is a cause,like i said google for yourself and add any other problems you may be having in your body.