1. Nightguard vital bleaching: How safe is it?;Haywood;Quintessence Int,1991
2. Chemical, optical, and physiological mechanisms of bleaching products: A review;Feinman;Pract Periodont Aesthet Dent,1991
3. Home-use bleaching survey-1991;Christensen;CRA Newsletter,1991
4. Tooth bleaching: its effect on oral tissues;Powell;JADA,1991
5. What about whiteners? Safety concerns explored;Berry;JADA,1990