ALEXANDRIA, Va., June 16 -- United States Patent no. 12,653,657, issued on June 16, was assigned to Sichuan University (Chengdu, China).

"Dental bleaching guide plate and preparation method thereof" was invented by Haiyang Yu (Chengdu, China), Jikui Sun (Chengdu, China), Yuqiang Zhang (Chengdu, China) and Junjing Zhang (Chengdu, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a dental bleaching guide plate, including a first plate and a second plate, wherein the first plate and the second plate are abutted to form an enclosed deep groove structure, the first plate is provided with a guide hole, a spacing between two opposite side surfaces of the first plate and the second...