Shitty toothbrushing and piss mouthwash
4/5 dentists recommend the leading toothpaste; the last one recommends this :P
I piss into a mouthwash cap, then take a huge messy dump on the floor and dip a toothbrush into it. Then I get to work on my dental (un)hygiene and brush with my chocolate brown toothpaste, and wash my mouth afterwards with my warm piss.