Hi, On the 42 day from a possible HIV exposure (unprotected oral on me and I had on her), as per the doctor guidance underwent Western blot test, hsvI&II, VDRL,hcv, tpha,hbs ag, urine complete analysis _ all result were nonreactive / negative. tongue is slightly white coloured - bad taste mettalic kind, no other issue. When all test are negative why it's white tongue? Do I need to anymore test or medication for white bas taste tongue/mouth. Please suggest.