In 1984, Gillette agreed to acquire Oral-B Laboratories from dental care company Cooper Laboratories for $188.5 million in cash. Revlon Group's Ronald Perelman offered to purchase 86.1 percent of Gillette for $3.8 billion in 1986, valuing the company at $4.1 billion. Gillette also bought back Revlon's stake in the company for $558 million. Revlon made two additional unsolicited requests to purchase Gillette for $4.66 billion and $5.4 billion in June and August 1987, respectively, both of which were rejected by Gillette's board of directors.