Royal Philips Electronics N.V. on Monday said it has agreed to acquire Culver City’s Discus Holdings Inc., maker of Discus Dental professional tooth whitening products, for an undisclosed amount.

Amsterdam-based Philips, with products including Sonicare electric toothbrushes, said the deal will expand its oral healthcare portfolio and help it build stronger relationships with dental practices. Discus will become part of the Philips Consumer Lifestyle unit.

“Discus’ professional tooth whitening business provides a strong foundation for growth in the cosmetic dentistry space,” Pieter Nota, chief executive of Philips Consumer Lifestyle, said in a statement.

Discus, which was founded in 1989, is a privately held company that employs about 400 people and sells products in more than 100 countries. Its product lines include Zoom, BriteSmile, and NiteWhite.

The deal is expected to close in the fourth quarter of 2010, pending regulatory approvals.

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