I know it sounds gross, but I had trouble brushing my teeth...
I was fine at showering and wearing deoderant, but until recently I was either too depressed to muster the energy to brush my teeth, or was so manic I just didn't care. But anyway, for the past 6 months of relative stability, I've been both flossing and brushing twice a day. My teeth feel amazing. Again, I hope that's not too gross a share.