The contributor's father had a toothache charm and he never suffered from toothache. If you get a toothache charm before you lose your teeth you won't get toothache. The contributor didn't have the toothache charm and she lost her teeth. There is some discussion about her dental problems.
Information about, and an example of, a toothache charm are found in 'Carmina Gadelica' vol. 2: IV. Uibe. Incantations: 126, p. 10