ABSTRACT
Objective: The objective of this randomized clinical study was to assess the onset time of the
whitening effect of a combined use of a nonabrasive, activator-containing toothpaste
and a light emitting diode (LED) device, compared to that of the toothpaste alone.
Materials and Methods: A nonabrasive, activator-containing toothpaste was used twice daily alone or combined
with an LED device for 15 days. The onset of the tooth whitening effect was evaluated
through tooth color (a* b*, CIELAB) and tooth whiteness (WIO) by image analysis of
standardized images. Local tolerance was assessed at days 1, 8, and 15. Results: On day 8, a significant (P = 0.003) tooth whitening effect compared to day 1 was observed with the toothpaste
and the LED device, sustaining until the end of the study. Whitening using the toothpaste
alone was significant compared to day 1 after 15 days, only. One subject reported
mild redness, itching, and burning on day 1 on the gum of the lower jaw that was possibly
related to with the toothpaste. The subject withdrew from the study. No adverse event
was reported in the group using the LED device. Conclusion: Both tooth whitening methods had a significant whitening effect after 15 days of
use. However, the onset of whitening was significantly faster when using the nonabrasive,
activator-containing toothpaste combined with an LED device. The toothpaste and LED
device were both safe.
Key words:
Light emitting diode-device - nonabrasive toothpaste - photoactivation - tooth color
- tooth whitening