White teeth, but for how long?

One of the Frequent Asked Questions heard on Cavex Bite&White is “How long will the treatment last?” Not much research is available on this subject. However, Professor Clifton made a useful overview of scientific evidence.


Tooth Whitening: What We Now Know

Clifton M. Carey, BA, MS, PhD Professor

University of Colorado, School of Dental Medicine

J Evid Based Dent Pract. 2014 June ; 14 Suppl: 70–76.


One of the common questions posited by patients is “How long will the treatment last?”

It is difficult to predict the persistence of bleaching regimens because the patient may routinely expose their dentition to food or beverages which are known to stain teeth and would experience re-staining within a month. However, if the teeth are not exposed to chromogens such as coffee, red wine, cigarette smoke, then it would be reasonable to assume that whitened teeth could persist for up to a year. There are several in vitro and clinical studies on this topic.


An in vitro study that looked at the color change of enamel, dentine, and combined

enamel and dentin of bleached tooth samples found that the color was not stable

over time with regard to lightness. However, yellowness did not return to baseline

within 1 year (ref 1.)


Another in vitro study designed to evaluate the color stability of bleaching after

light activation with either a halogen unit, laser, LED unit; or bleaching without

light activation found that all the tested methods achieved good aesthetic results

even 3 months after the end of the bleaching. Additionally, the authors found that

light activation of the bleaching agent was not beneficial compared to bleaching

alone and light activation made no difference in the color stability up to 3 months

after bleaching (ref 2.)


In a recent clinical trial, it was found that by following a regimen consisting of in-office

bleaching for two sessions with a 1-week interval, followed by home bleaching once a month for 3 months gave more persistence in color change over a 6-month period than in-office bleaching alone. This later study shows that this regimen for whitening maintenance can extend the effectiveness of the whitening treatment (ref 3.)



Ref 1.

12-Month color stability of enamel, dentine, and enamel-dentine samples after bleaching.

Clin Oral Invest. 2008; 12:303–310.

Wiegand A, Drebenstedt S, Roos M, Magalhaes AC, Attin T.


Ref 2.

Efficacy of tooth bleaching with and without light activation and its effect on the pulp temperature: an in vitro study.

Odontol. 2013; 101:67–74.

Hahn P, Schondelmaier N, Wolkewitz M, Altenburger MJ, Polydorou O.


Ref 3.

Efficacy and persistence of tooth bleaching using a diode laser with three different treatment regimens.

Eur J Esthet Dent. 2011; 6:436–445.


Al Quran FAM, Mansour Y, Al-Hyarl S, Al Wahadnl A, Mair L.

Website design & development by Picturae