The FDA sent a warning letter flagging "significant violations" of manufacturing regulations for Tom's of Maine toothpaste.

An inspection this year of a Tom’s of Maine’s facility in Sanford, Maine, turned up several violations, including bacteria in water used to make toothpaste, bacterial growth in another type of toothpaste and “a black mold-like substance” near manufacturing equipment,

Tom’s of Maine toothpaste was cited by the U.S. Food and Drug Administration for violating Current Good Manufacturing Practices by using contaminated water in its products and being sold to consumers despite knowledge of the contamination.