Toothpaste

In a pinch, you can use baking soda to make a toothpaste. Mix equal parts water and baking soda until you have a paste. Add a small amount of peppermint oil or another sweetener if you don't like the salty taste.

Note that fluoride is super important for teeth health! You should be using toothpaste with added fluoride whenever possible. If this is not available, fluoride pills exist and can help.