Hi.. Thanks for the query.. Oral Thrush is a yeast infection and commonly occurs due to any underlying disease or medical condition like side effects of medication like steroids and antibiotics, dry mouth, stress, diabetes, immuno-compromised condition etc.. If it is discoloured white then it is probably that the infection is still present.. But first of all you should consult an Oral Physician or an Oral Pathologist and get evaluated so that the underlying cause of the problem can be ruled out and treated and once the cause is treated the infection will also subside.. For now you need to get a microscopy of scraping from tongue and root of the mouth has to be done.. If it is thrush then you need to take another script of antifungal medication like Nystatin mouthwash, Clotrimazole lozenges and oral anti-fungal medication like Fluconazole, Itraconazole etc.. Take plenty of probiotics like Yogurt and garlic.. Clean your tongue using a tongue scraper.. Drink plenty of water.. Hope this helps.. Regards..