A warning letter from the Food and Drug Administration (FDA) said the agency’s investigator found a “black mold-like substance” during a Tom’s of Maine inspection in May. The letter, sent Nov. 5, said the investigator observed several violations during the inspection,

Tom's of Maine, a popular natural brand of toothpaste and personal care products, got a warning from the FDA about bacteria at its facility and in its products. Here's what you should know.