ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,338, issued on Jan. 13, was assigned to TOOTHFILM INC. (Taipei, Taiwan).

"Tooth brightening composition, kit, and method of using the same" was invented by Chung-Lin Lee (Taipei, Taiwan), Zhi-Yun Lin (Taipei, Taiwan), Rui-Feng Yen (Taipei, Taiwan), Jian-Hong Lai (Taipei, Taiwan) and Kuan-Te Su (Taipei, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a tooth brightening composition comprising polyurethane, at least one white food colours and at least one blue food colours and optionally other orally acceptable carriers and/or excipients. The present disclosure also provides a tooth brightening kit and a tooth b...