In a tooth whitening method, a whitening composition is applied to at least one tooth. The whitening composition is maintained on the at least one tooth for a first time period. After the first time period, a light radiation is directed toward the at least one tooth for a second time period. The fir
In a tooth whitening method, a whitening composition is applied to at least one tooth. The whitening composition is maintained on the at least one tooth for a first time period. After the first time period, a light radiation is directed toward the at least one tooth for a second time period. The first time period has a duration greater than 50% of a total duration of the first and second time periods. The whitening composition is removed from the at least one tooth.
대표청구항▼
1. A method of whitening teeth, comprising: applying a whitening composition as a layer having a thickness less than about 0.3 mm to at least one tooth;maintaining the whitening composition on the at least one tooth for a first time period without an application of light radiation; andafter the firs
1. A method of whitening teeth, comprising: applying a whitening composition as a layer having a thickness less than about 0.3 mm to at least one tooth;maintaining the whitening composition on the at least one tooth for a first time period without an application of light radiation; andafter the first time period while the whitening composition remains upon the at least one tooth, directing a light radiation toward the at least one tooth for a second time period, the first time period having a duration greater than 50% of a total duration of the first and second time periods; andremoving the whitening composition from the at least one tooth; wherein the whitening composition is translucent and is applied to said at least one tooth by a translucent strip or tray, and wherein said light radiation is directed toward said tooth through said translucent strip or tray and through said translucent whitening composition;and wherein the radiation intensity is no greater than about 150 mW/cm2. 2. The method of claim 1, wherein the duration of the first time period is at least 80% of the total duration of the first and second time periods. 3. The method of claim 1, wherein the light radiation is selected for absorption by a stain on the at least one tooth by selecting a wavelength corresponding to a color substantially opposite a color of the stain on the 1976 CIE LAB color scale. 4. The method of claim 1, wherein the light radiation is provided at a wavelength between about 440 nm and about 490 nm. 5. The method of claim 1, wherein no photosensitizing agent is applied to the at least one tooth. 6. The method of claim 1, wherein the total duration of the first and second time periods is up to about 60 minutes, and the second time period is no greater than 5 minutes. 7. The method of claim 1, wherein the whitening composition comprises a layer that is applied to the tooth such that the whitening composition has a peroxide density less than about 1.3 mg/cm2. 8. The method of claim 1, wherein the whitening composition comprises a peroxide active having a concentration between about 7.5% and about 20% of the whitening composition. 9. The method of claim 1, wherein the whitening composition is applied to the at least one tooth in a layer having a thickness less than about 0.2 mm. 10. The method of claim 1, wherein the whitening composition is provided on a strip of material configured to block light waves having a frequency of greater than about 700 nm. 11. The method of claim 1, further comprising maintaining the whitening composition on the at least one tooth for a third time period after the second time period. 12. The method of claim 1, wherein the tooth whitening composition does not include a photosensitizing agent. 13. A method of whitening teeth, consisting of: applying a translucent whitening composition including a peroxide active having a concentration between about 7.5% and about 20% to at least one tooth in a layer having a thickness less than about 0.3 mm and a peroxide density less than about 1.3 mg/cm2;maintaining the whitening composition on the at least one tooth for a first time period of about 25 minutes to about 29.5 minutes without an application of light radiation; andafter the first time period, directing a light radiation provided at a wavelength between about 440 nm and about 490 nm and an intensity of no greater than about 45 mW/cm2 toward the at least one tooth for a second time period of about 0.5 minutes to about 5 minutes while the whitening composition remains upon the at least one tooth;and removing the whitening composition from the at least one tooth. 14. A method according to claim 13 wherein the translucent whitening composition is applied to said at least one tooth from a translucent strip, and the light radiation is directed onto said tooth through said translucent strip and through said translucent composition. 15. A method of whitening teeth, comprising: applying a whitening composition as a layer having a thickness less than about 0.3 mm to at least one tooth;maintaining the whitening composition on the at least one tooth for a first time period without an application of light radiation; andafter the first time period removing the whitening composition from the at least one tooth, and directing light radiation toward the at least one tooth for a second time period, the first time period having a duration greater than 50% of a total duration of the first and second time periods, wherein the radiation intensity is no greater than about 150 MW/cm2. 16. The method of claim 15, wherein the duration of the first time period is at least 80% of the total duration of the first and second time periods. 17. The method of claim 15, wherein the light radiation is selected for absorption by a stain on the at least one tooth by selecting a wavelength corresponding to a color substantially opposite a color of the stain on the 1976 CIE LAB color scale. 18. The method of claim 15, wherein the light radiation is provided at a wavelength between about 440 nm and about 490 nm. 19. The method of claim 15, wherein no photosensitizing agent is applied to the at least one tooth. 20. The method of claim 15, wherein the whitening composition comprises a layer that is applied to the tooth such that the whitening composition has a peroxide density less than about 1.3 mg/cm2. 21. The method of claim 20, wherein the whitening composition comprises a peroxide active having a concentration between about 7.5% and about 20% of the whitening composition. 22. The method of claim 21, wherein the whitening composition is applied to the at least one tooth from a strip, said composition being in a layer having a thickness less than about 0.2 mm. 23. The method of claim 22, wherein the total duration of the first and second time periods is up to about 60 minutes, and the second time period is no greater than 5 minutes. 24. A method of whitening teeth, consisting of: applying a whitening composition including a peroxide active having a concentration between about 7.5% and about 20% to at least one tooth in a layer having a thickness less than about 0.3 mm and a peroxide density less than about 1.3 mg/cm2;maintaining the whitening composition on the at least one tooth for a first time period of about 25 minutes to about 29.5 minutes without an application of light radiation; andafter the first time period, removing said whitening composition and directing a light radiation provided at a wavelength between about 440 nm and about 490 nm and an intensity of no greater than about 45 mW/cm2 toward the at least one tooth for a second time period of about 0.5 minutes to about 5 minutes. 25. A method according to claim 24 wherein the whitening composition is applied to said at least one tooth from a strip.
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