Donovan patented DentaLoop, pre-cut disposable dental floss loops, on June 18, 1985, which she manufactured and sold through her own company.
Decades after her diaper innovations made her a household name in the annals of American invention, Marion Donovan returned to consumer product design with DentaLoop, a pre-cut, looped dental floss product intended to make flossing easier and more hygienic. She was granted U.S. Patent 4,523,600 on June 18, 1985.
The DentaLoop design eliminated the need for users to wind floss around their fingers repeatedly, instead offering a ready-made loop that could be discarded after a single use, improving both convenience and dental hygiene. As with her earlier ventures, Donovan did not merely license the idea to an established company; she manufactured and marketed DentaLoop herself through her own firm, Marion Donovan Associates, demonstrating her enduring entrepreneurial independence well into her sixties.
This invention illustrates the breadth of Donovan's inventive career, which was never confined to infant care products. Over her lifetime she would ultimately hold twenty patents spanning categories from household organization to personal hygiene, and DentaLoop stands as one of her most commercially notable inventions from the later phase of her career, reflecting a consistent pattern: identifying a small, universal daily annoyance and engineering an elegant, patentable fix.