It is not uncommon to suffer an oral 'Thrush' post surgery. It can be caused by the intubation process and drying out by anasthetics leaves the mouth vounerable. An oral anti-fungal as suggested will sort this but make sure you get it checked out if this does not work.
Yes, it sounds like a fungal infection, does it have a white apprearance when you look in the mirror?. I've had this issue many times and it turned out to be a fungal infection. consult your doctor she or he will prescribe a fungal medication to take orally, probably Diflucan, good luck and let me know how things go! take care. Sincerely, Elizabeth
which kind ov surgery u had?r u taking any sort of medications???itmust b a side effect...btw take vit a supplements it will help with the mouth drying...regards