Venkat... maybe cleaning more frequently will help a little. I used to rinse with the baking soda mix frequently, and at bed and in the morning brush my teeth and use a waterpik to clean out the sticky saliva. Also if you stay away from sugar it may help, apparently it helps thrush thrive. good luck sorry you're having so much trouble. If you are doing flouride treatments they may be why you're having trouble with redness, frankly though the radiation can cause all that but it does get better once you're done. take care.