In Vivo studies of internal bleaching

Brown 1965

• 82.5 % “responded”
• Howell 1980
  • 90.3 % satisfactory
  • 2.4 % no change
  • 7.3 % “considerable improvement”
• Holmstrup et al 1988
  • 63.2 % good
  • 26.3 % acceptable
  • 10.5 % unacceptable
• Friedman et al 1988
  • 50 % successful
  • 29 % acceptable
  • 21 % failed