As far as showers, you don't have to do it everyday. Its better for your skin and hair to go a few days in between.
But every three days or so, make it your happy, sensory deprivation/enhancement place. Try aromatherapy, crank the watery tunes, and get into a zen space. Water is very healing.
Lavender, eucalyptus, rosemary or cypress are great scents to relaxing in the shower.
If that fails, I can't stand washing dishes so I put a TV next to the sink. Maybe put a TV in the bathroom?
As far as brushing your teeth - hmmmm.... I have very sensitive teeth so it feels good to brush my teeth. Maybe you can pretend you have senstive teeth.