I haven't brushed my teeth in years.
Why haven't you brushed your teeth?
There are many reasons why I don't brush my teeth. For one thing, it is really uncomfortable to open your mouth and stick a brush in there. Also, when I do brush my teeth, I get the feeling I'm forced to be doing things I don't want to do.
It's really not healthy to forgo brushing your teeth. People are expected to at least engage in the bare minimum of personal hygiene.
So what if I don't brush my teeth. As far as I know, there are very few consequences.
There are lots of health consequences for not brushing your teeth including cavities and gingivitis. Brushing your teeth is a base level of cleanliness that you must engage in. Drop your defense against this practice or be prepared for the consequences.