Frank Michael Booth, who previously worked at the Oasis Dental Care Ltd, Walkers Court Dental Practice, in Garstang, was investigated over claims relating to his standard of care and costs of services.In the case of one 91-year-one patient, Booth charged over ??3,000 for treatments including failed implants, root canals and crowns, which were proven to be unprofessional, misleading and dishonest.