Tips on Cleaning Your Teeth and Taking a Shower With Back Pain
When brushing your teeth rinse with a cup of water, don't bend, it's a classic position to trigger low back pain.
If you have to have a bath as you have no shower, either bend your knees to the floor then fill up your bath or get someone else to fill the bath for you. I have pulled my back out twice while filling a bath. When you do have a shower remember to have your toiletries at the correct height so that you are not stretching or bending.