People have long paid close attention to teeth. As far back as ancient Egypt, people were already coming up with ways to protect and care for their teeth. In ancient Greece in the time of Pericles, Hippocrates, the "Father of Medicine", wrote down the treatment of tooth decay and gum disease.
The electric dental drill was first patented in the 1870s.
In 1905, a German scientist first synthesized the local anesthetic drug procaine.
But none of this has anything to do with the seven-year-old Tooth Fairy.
She was just a child plagued by tooth aches. The agonizing pain was like a congenital curse. Curled up on her side alone with her eyes open wide, she quietly endured countless eight-hour countdowns—until she saw that little thing making off with a baby tooth from beneath her pillow.
Without a moment's hesitation, she reached out and caught the little creature by the belly between her fingers. It struggled persistently, sprinkling her arm in wing dust, but that didn't matter. She instinctively inserted it into her mouth. The wings melted on her tongue, releasing an aroma of gardenia mixed with peppermint oil. Then came the body—sour at first, but it then gave way to the alarming sweetness of slightly spoiled raspberries.

She ate slowly—or was it quickly? She'd already lost track of the time.
When she finally emerged from the sensation, the tooth aches were gone. She knew her teeth would never hurt again.
Tooth Fairy quietly lay back down upon the downy bed. She licked the glittering scale dust from her hand, recalling the tooth fairy's taste as it burst in her mouth. She remembered how it cursed her to have all her teeth stolen until she was left a miserable old crone. But she wasn't concerned. "I have to become a dentist," she thought. "I have to let every Arcanist taste this."

#74
Republic of France, Paris
Human child, upper right first baby molar

#79
Republic of France, Nord-Pas-de-Calais
Albino Olitiau, lower-right twelfth fang

#186
Republic of Poland, Lower Vistula River
European bison, third pair of incisors

#322
Kingdom of Sweden, Lake Vänern
Nordic deer woman, upper left incisor

...

Pandora Wilson: Hello, Miss Campbell.
Tooth Fairy: Hello. You can call me "Tooth Fairy".
Pandora Wilson: Ah, yes, I'm familiar with the title. Though, I'm surprised that you'd go by the same name as those spirits. I was under the impression that you were on hostile terms.
Tooth Fairy: Perhaps. But I don't feel that way about them.
Tooth Fairy: They single-mindedly collect teeth and strictly follow their own rules, that's all. I capture, keep, and kill them to make medicine... But in a way, I admire their approach.
Pandora Wilson: It seems you've formed a unique relationship.
Tooth Fairy: I don't deny that.
Pandora Wilson: So, are you simply inclined to go by this name, or do you resent your family name?
Pandora Wilson: Some people born to Arcanist families certainly feel that way. And to my knowledge—I mean no offense in saying this—the Campbells has always held a... delicate position.
Tooth Fairy: No offense taken.
Tooth Fairy: I'm well aware of the Campbell family's methodology.