Founded Great Gums Inc. with Silicon Valley healthcare venture capital in San Francisco, CA, 2024.

• Professional team for sales and marketing
• Dental Champion program
• Collaboration with College of Dental Medicine, Columbia University, New York

Japanese Market

Global No.2 Oral Healthcare 

• Collaboration with dental clinics, local business partner
• Department store and online activities
• Launched product in 2024

TROMATZ Japan Co., Ltd. was established in Tokyo, bringing the brand's patented bio-current technology to the Japanese market. TROMATZ has since been recognized by leading Japanese media and technology events.

Sadao Kihara
Chairman, TROMATZ Japan

A nearly half-century veteran of Japan's health equipment industry, Sadao Kihara joined Fuji Iryoki Co., Ltd. in 1968 and rose to President & CEO in 2012, leading its massage chair business to the world's No.1 market share. His approach was never just about specs — guided by the belief "sell satisfaction, not just products," he built his career on turning what people needed into what they truly wanted.

Now he brings that same philosophy to TROMATZ. As Chairman, Kihara is building the brand's distribution network across Japan — forging partnerships with dental clinics, beauty and healthcare facilities, and sales agencies nationwide, with one clear goal: turning TROMATZ's patented technology into a brand people want.

Koji Kinbara
CEO, TROMATZ Japan

Koji Kinbara leads TROMATZ Japan's local market execution — building partnerships with dental clinics and expanding the brand's presence across department store and online retail channels in Japan.

Dr. Youngwook Kim
CTO, TROMATZ Japan

Dr. Youngwook Kim is the inventor of TROMATZ's core bio-current technology, the patented innovation behind the brand's entire product line.