Toothache, Dry Salt and Alum for

"Equal parts. Take common salt and alum. Mix and pulverize these together, wet a small
piece of cotton and cause the mixture to adhere to it and place in the hollow tooth. At first a sensation of coldness will be produced, which will gradually disappear, as will the toothache. This is an excellent remedy and should be given a trial by any person suffering with this trouble."

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter