5 years. The dental hospital ensures that the quality of care provided by the dental hospital is at its best. The service life of the dental chairs and instruments purchased by the dental hospital is usually calculated based on 5 years. The service life of the dental chairs in Dantes Dental Hospital is also calculated based on 5 years. Guangdong Dantes Medical Equipment Co., Ltd. is a high-tech enterprise established in 1999 that integrates the research and development of dental treatment chairs and denture processing.