Upgrade: Get a check up and hygiene appointment too! Ortho London Dental Clinic: All procedures are carried out by the Ortho London team, a group of experienced dentists. Included: Online or face to face consultation and welcoming kit. Location: Treatment carried out by a professional dentist at Ortho London, based in Harley Street or King William's Street. Dental retainers: Maintain the actual position of the teeth with one or two arches of dental plastic retainers. Valid: Mon, Fri and Sat, 10am-8pm. Arch Retainer | Regional | Living Social | Living Social