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Do you know how many units that , - - different units or different engines that they have tested , other than the two that have been approved and possibly this , - - what did you call this last one ? Many dentists consider the staining , called dental fluorosis , to be strictly a cosmetic concern because it 's usually mild - - chalky streaks or splotches on one or more teeth . Many problems involve many - - potentially , infinitely many - - global states or configurations . Private foundations - - nonprofit corporations or trusts endowed by a single donor , usually a family or a corporation , for the purpose of giving grants - - have faced increasing scrutiny .