From The Long Lost Friend:
Deafness and Toothache
A few drops of refined camphor-oil put upon cotton, and thus applied to the aching tooth, relieves very much. When put in the ear it strengthens the hearing and removes the roaring and whizzing in the same.
The grimoire The Long Lost Friend lists this spell.
Timeline of related events
1820Publication of Hohmann's Long Lost Friend (lists this spell)