We order toothpaste online and sometimes run out for a while until we can get more ordered. I have my children rinse with a herbal infusion after brushing. (I use it too.) It keeps the stinky mouth syndrome away.
I usually use a mix of rosemary, thyme, spearmint and sage but sometimes I just use thyme. I make a strong infusion and keep it in the fridge. I dilute it with warm water before rinsing.