According to (Tianyancha), Dr. Ya and Dr. Yida are both produced by Guangzhou Qiancai Cosmetics Co., Ltd., but the work of the two companies is different. Dentist is a company specializing in dental services, providing dental treatment services such as tooth cleaning, tooth whitening and orthodontics. Dentist Yida is a company specializing in chewing gum and oral care products, and is committed to providing oral health and fresh breath products.