Yishibai (Shanghai) Medical Technology Co., Ltd. is a group company whose brands include Yeswite™, SIMPLE NewPure®, Esmile®, and Zhengyou® J Series. Its factory is located in Nanchang, Jiangxi Province, operating under Nanchang Yibaikang Technology Co., Ltd. The whitening brand produced there is the SIMPLE NewPure® Professional Teeth Whitening System.

The company was formerly the Chinese manufacturer for Puyang Technology (Beyond). It is one of the earliest tooth whitening enterprises in China that integrates scientific research, manufacturing, design, and sales under one roof.

The teeth whitening equipment and materials independently produced by the company have been recognized as meeting national standards (GB-compliant). In collaboration with China Medical Science and Technology Press, the company co-published the Clinical Manual of Tooth Bleaching. With nearly two decades of specialized research in professional tooth whitening, the company has long-term partnerships with well-known domestic universities, dental colleges, and research institutes, giving it extensive industry experience in the field of tooth whitening.