2. Saltwater
Salt is one of the cleanest substances on earth, and this means that it makes for one of the best cleaning agents that we know: Salt is often called upon to treat infections in the mouth (or elsewhere in the body), and these areas are rinsed out on a regular basis with saline solution , which basically just means a solution of water and salt.
Toothache can often be caused or worsened by bacteria or food particles between the teeth, and if you already have toothache to begin with, brushing your teeth is no easy task and might do more harm.
Rinsing your mouth with saline solution can prevent you from getting an infection from what’s causing your toothache, and it might even help to relieve the associated pain.
The simple use of salt water has been known to keep what could have been deadly infections at bay, and the method is well-known as a lifesaver (and yes, even recommended for the cleaning of recent piercings).