Gillette Co.provided revised income statements for 1999 and 2000, but said the accounting changes would have no impact on its overall profits. The revision reflects Boston-based Gillette’s adoption of accounting changes for sales incentives, a new oral care business segment and other internal adjustments. The changes took effect Jan. 1.Last May, the Financial Accounting Standards Board’s Emerging Issues Task Force reached a consensus for recognizing certain sales incentives such as r...