Gotta keep that emergency tendie stash on the headboard

It's reasonable for most people to hit the Carlin-4 twice a day. If not for social reasons, then for health and hygiene.

Dentists say we ought to brush twice a day, morning and night. My dentist once told me that if I'm only going to brush once a day, then it should be at night. You don't produce as much saliva while sleeping, and that creates a better environment for the bacteria that cause tooth decay. Brushing at night removes the tiny food particles that bacteria feed on, reducing the likelihood of developing tooth decay and gingivitis.

We then brush again in the morning because the lack of flowing saliva overnight causes a buildup of other bacteria that feeds on mucus, which is the cause of "morning breath".

The point being that you are going to bed with a day full of activity/dirt/sweat/stank.