1: Refers to usmile's first cushioning technology brush head. 2: DuPont bristles, containing special particles, effectively increase the friction on teeth to achieve better whitening effects. 3: Releases chloride ions when brushing teeth, which plays a certain role in repairing tooth enamel and preventing decay. 4: The above data comes from the usmile internal laboratory. 5: When the blue bristles are faded into white, it indicates that the bristles may be damaged after being used for a long time, and need to be replaced. 6: Data from the usmile technology testing center.* usmile Sonic Electric Toothbrush Y1S is certified by the American Dental Association (ADA).** Refers to the total number of all usmile products-related awards.*** Refers to the total number of authorized patents from the usmile brand company - Guangzhou Stars Pulse Co., Ltd. Statistics as of March 14, 2023. The above 450 + patents have obtained patent certificates, including but not limited to: Electric Toothbrush: Chinese Invention Patent, Patent No. ZL202010625423.8; Chinese Utility Model Patent No. ZL202022578328.5: Chinese Utility Model Patent No. ZL201920492944.3: Chinese Utility Model Patent No. ZL2019203777706: Chinese Utility Model Patent, Patent No. ZL202020693145.5376 Dental Flosser: Chinese Utility Model Patent, Patent No. ZL202122406730.X; Chinese Utility Model Patent No. ZL202121910195.5: Chinese Utility Model Patent, Patent No. ZL202121909816.8; Chinese Utility Model Patent, Patent No. ZL202121909754.0; Chinese Utility Model Patent...... Chinese Utility Model Patent, Patent Number: ZL202123203607.4; Patent Number: ZL 2021 2 3195656.8