|
METHOD |
Effect 0-10 | Positives | Negatives |
| Whitening toothpaste | 0 | None | Useless |
| Whitening strips | 2 | Convenience | More expensive than tray bleaching over time |
| At-home tray bleaching | 5 | Practicality; best overall | Initial $275 expense |
| Porcelain Veneers | 9-10 | Superb Immediate Result | $979/Veneer: Irreversibly alters teeth |
Over many years Clinical Research Associates (CRA) have studied the effect of light and heat on bleaching. The latest of their studies was published in the most recent CRA Newsletter (March 2003), in which they reported on the characteristics of several in-office bleaching systems using light. The following quote includes part of the CRA conclusions from that newsletter: "Use of lights according to the manufacturer's directions did not improve whitening for any system tested." Systems tested in the CRA study were: LaserSmile, LumaArch, Niveous, Opalescence Xtra Boost, PolaOffice, Rembrandt 1 Hour Smile-Whitening Program, and Zoom. Tests on BriteSmile have not yet been completed. In these studies, light use did not speed or increase the bleaching over the use of bleaching chemicals alone; The slight difference in tooth color observed as a result of bleaching with lights and hydrogen peroxide versus bleaching with hydrogen peroxide alone appears to be temporary and caused by the light's dehydration and heating of the teeth. The light might increase the whitening capability a few percentage points but it really isn't even enough to notice. After a few days to weeks, there appears to be no significant shade difference between teeth bleached with lights and those bleached without lights. Although research varies as to the effectiveness of bleaching using lights, many of the lights used for in-office bleaching appear to be primarily a psychological factor for the patient.[8]
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