My 10 year old son was having fever last week. When the fever was not controlled with tylenol, he was taken to hospital and started taking ibuprofen 400mg(36.6kg body weight) 6 hourly. The very next day it was found that his lips and gums and swollen and reddish and with pus here and there. He was taken to the hospital again and is now taking Apo-acyclovir 200mg, 6 hourly. It is the second day after staring the medicine. He is showing difficulty in breathing too. What should be reason for the dental disease? He had no problem with the teeth or gum before. I am concerned about this? Why it happened? How we can take care of the teeth and gum, cleaning, at this time? Please suggest.