
This seemed like a good idea at the time
Calomel was used as a medicine from the 16th century through the early 20th century. By the 19th century, calomel was viewed as a panacea, or miracle drug, and was used against almost every disease, including syphilis, bronchitis, cholera, ingrown toenails, teething, gout, tuberculosis, influenza, and cancer. In 1853, Samuel Jackson described the harmful effects of calomel on children in his publication for Transactions of Physicians of Philadelphia. He noted that calomel caused gangrene on the skin, loss of teeth, and deterioration of the gums. Eventually, calomel's popularity began to wane as more research was done, and scientists discovered that the mercury in the compound was poisoning patients. During the 19th century, calomel was used to treat numerous illnesses and diseases like mumps, typhoid fever, and others — especially those that impact the gastrointestinal tract, such as constipation, dysentery, and vomiting. As mercury softened the gums, calomel was the principal constituent of teething powders until the mid-twentieth century. Babies given calomel for teething often suffered from acrodynia. Calomel, in high doses, led to mercury poisoning, which had the potential to cause permanent deformities and even death. Some patients experienced gangrene of the mouth generated by the mercury in the medicine, which caused the tissue on the cheeks and gums inside the mouth to break down and die. Some patients would lose teeth, while others were left with facial deformities.