The invention provides external 
medicine for treating 
toothache. The 
medicine is characterized by consists of the following 
raw material medicine in weight: 25g of 
alum and 120g of fresh snakeweed. A preparation method of the medicine comprises the following steps that: the 
alum is crushed and is screened by a 
sieve being 80 meshes, the snakeweed is cleanly washed, the 
alum and the snakeweed are uniformly mixed and are mashed into juices to be dripped into the auditory meatus. The medicine has the efficacies and beneficial effects that the alum is cold in property and is acerb in taste, a strong convergence effect is realized, and the efficacies of eliminating 
toxin, killing intestinal worms, removing dampness, relieving 
itching, stopping bleeding, stopping diarrhoica, clearing away the heat and dissolving the 
phlegm are realized. The alum also has antibacterium effect, anti-
trichomonas-vaginalis effect and the like. The snakeweed has the effects of clearing away the heat, realizing 
diuresis, cooling the blood and eliminating the 
toxin. The medicine mainly treats heat accumulation of the bladder, 
dysuria, leucorrhea, summer damp 
diarrhea, 
nosebleed, hematuria, liver heat and hot eyes, swelling and pain in 
throat and swollen welling-
abscess toxin and has the anti-inflammatory effect. The external medicine has the advantages that the preparation is simple, the 
side effect is small, and the external medicine is applicable to various kinds of 
toothache.