The thegentlemen ransomware group listed First Dental Health on its data leak site on 2026-10-17. Country: US Sector: Healthcare Domains named: firstdentalhealth.com Claim as published on the leak site: firstdentalhealth.com First Dental Health, Inc. dental consulting company founded in 1995 and based in Sacramento, California. It is led by Chairman and CEO Michael Zhang together with founder Dr. Rick Kershner, a periodontist who previously worked with Western Dental, Coast Dental and Pacific Dental Services. The company transforms existing dental practices of 40 to 250 chairs through leadership development, culture building and operational excellence, typically raising performance by 40 to 80