Toothache

Deciduous and Prairie:

Wild Licorice

• Glycyrrhiza lepidota
• Found in prairies, fields
• Active chemical ingredient is glycyrrhizin(Source)
• glycyrrhizin: a crystalline glycosidic acid C₄₂H₆₂O₁₆ constituting the sweet constituent of glycyrrhiza(Source)

(Source)

• the fresh root was chewed to treat toothaches(Peterson Field Guide).

Deciduous:
Sweet or Black Birch Tree

• Betula lenta
• Found in rich woods
• Active chemical ingredient is methyl salicylate(Source)
• methyl salicylate: methyl salicylate a natural or synthetic oil with a characteristic wintergreen odor and taste; used as a counterirritant in ointments or liniments for muscle pain and  also as a flavoring agent. Called also wintergreen oil(Source)

(Source)

• Used for fragrance, in bark tea for fevers, stomachaches, lung ailments, twig tea for fever. to alleviate pain or sore muscles, the oil is applied.