Sugar-resistant Guangzhen and Whitening Zhen are the products of Professor Royal, a brand in Singapore, which mainly makes oral skin care products. Singapore's oral skin care products are very famous, and the brand Meifu Lohas a high reputation in the local area. Their scientific research experts are very professional and authoritative, and they are one of the best brands of oral beauty products in Singapore. If you agree with my answer, please adopt it.