How do you know you have periodontitis?

The symptoms of periodontitis are: The gums become red and swollen Spontaneous bleeding, pain, and bad breath Release of pus from the pockets Exposure of the dental necks Loosening of the teeth and,...

like anybody knows.

Only an idiot would think of some thing like that to say, shun you.

The I know song

I'll take a stab at it: This seems to mean that it is a high order of knowledge to have a sense of the limits of one's knowledge. Being 'smart' and 'informed' or 'savvy' is great, but being aware of...