Its main consumer business is the development, manufacturing and sale of oral care products[1][2] (toothpastes, interdentals, dental rinses and toothbrushes) globally marketed under the GUM brand.

The introduction of metal tubes for packaging of the rubber glue, and later also toothpaste, formed the basis for the early success of the business.

After having been listed on the Osaka Securities Exchange since 1961, Sunstar undertook a management and employee buyout of all shares in 2007.

[8] The ownership of Sunstar Japan and the other group companies of the consumer goodsbBusiness was transferred to Switzerland, and the industrial business to Singapore, in an effort to accelerate globalization.

Butler, Inc. 20 years later, in 2007, Sunstar started the transfer of the headquarters office functions to Switzerland and privatized ownership by management and employee share buyout (delisted from Osaka Securities Exchange).

[13] In 2018, Sunstar Engineering Americas won an Innovation Award from the Adhesives and Sealants Council (ASC) for "automated application of UV Curable Foams".