hello sir, my son is 14 years old, he is detected with DNS( from last 2-3 years, doctors has advised for surgery only after he will be 16). Like any other teenager, he is very careless about his health. but I have noticed that his mouth is always open in the night, might be he is unable to breathe from nostrils. And his right side of nose is hardened and swallowed( where DNS is detected). One more thing, his mouth is full of mucus in the morning, and from last few days he is started coughing( light and intermittent). Thanks.