Yes Apple Cider Vinegar can be used to get rid of a toothache due to it's antibacterial and antiviral properties.
To get rid of your toothache using Apple Cider Vinegar take a cotton ball and soak the cotton ball in the Apple Cider Vinegar and then place the cotton ball soaked with Apple Cider Vinegar onto the affected tooth until the tooth pain goes away.
You may need to repeat this procedure a few times until the toothache fully goes away.
You can also use the Apple Cider Vinegar as a mouth wash which can help to ease a toothache and get rid of the bacteria in your mouth.