Yes, daily! Why the seemingly problematical fact of cleaning one's teeth in the shower?
Whilst my hair conditioner is 'doing its' thing' is when I clean the fangs! When that's finished, it's time to wash-out the hair conditioner!
My sister-in-laws family brushed their teeth in the shower and I thought it was weird, but gave it a try myself and it wasn't all that bad. They said it saved time and water. It does seem like it saves a bit of time, but not too sure about the saving water. It would be interesting if that could be measured.
Always! It is so much easier to gargle etc and to have no worries rinsing etc!!! While I do my utmost to save, recycle, etc, as far as showers are concerned I just carry on; it's my twice weekly luxury - don't bath; always use minimum water at the sink although I do use running water to rinse washcloth - have an abhorrence of a sink full of scummy water!
No, I'd never thought of brushing my teeth in the shower! At night, I clean my teeth at the handbasin, without the tap running, although I do have to wet the brush 1st, so I may do that now, before I exit from the shower!