Bleaching


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bleaching

[blēch′ing]
Etymology: ME, blechen
the act or process of removing stains or color by chemical means.
Dentistry The process of removing stains from the teeth; whitening is the generally preferred term
Dermatology The process of removing color or pigment from the skin using various potentially harmful chemicals
Environment A mass extinction of coral in certain regions which is variously attributed to global warming or to local stressors
Vox populi The removing of stains or colours, in particular, the process of whitening fabrics by chemicals—e.g., bleach, or bleaching powder consisting of chloride of lime

Bleaching

Technique used to brighten stained teeth.
Mentioned in: Cosmetic Dentistry

Bleaching 

1. The process of changing colour from the pink of a dark-adapted retina to a pale yellow colour after it has been exposed to light. This is due to the reaction of the rhodopsin pigment. The process is reversible if the healthy retina is allowed to remain in the dark.
2. Process to remove a tint from organic lenses. See visual pigment.

bleach, bleach·ing

(blēch, blēching)
Removal of color from an object using chemicals or light.

bleaching,

n the use of a chemical oxidizing agent to lighten tooth discolorations. Preferred term is
whitening. See also agent, whitening.
References in periodicals archive ?
In addition to the bleaching events, (http://science.
2,3 In order to improve the appearance of smile by lightening of teeth bleaching is the best conservative treatment.
Temperature is the single largest stressor facing modern coral reefs, and currently the world is witnessing annual bleaching events, despite predictions that the phenomenon would not occur for several decades.
An ecological advantage of the organIQ BLEACH System in comparison to KMnO4 is the good degradability of the bleaching agent.
When bleaching is mild, the corals can regain their colour as water temperatures drop, and most of them will survive.
Cloud cover and heavy rain in the central and southern region of the GBR have provided some relief from the heat stress, though some mid-shelf and outer reefs had displayed minor to moderate bleaching, "some of which is typical for this time of year".
Tooth bleaching is one of the most demanded clinical procedures in dental practice1.
This practice is most deadly in countries such as Tanzania, where people make their own bleaching concoctions from a mixture of dangerous household chemicals, put-ting users at risk of both aesthetic and medical dangers.
Bleaching discolored non-vital teeth has been described for the first time in 1864.
It is very important for dairy processors to understand how bleaching can impact the flavor and functionality of dried ingredients.
As to the bleaching procedures, there is a general concern regarding their effects on enamel and dentin, since changes in tooth structure, such as those related to porosity, (7) demineralization (8-10) and reduction in the adhesion of restorative materials (5,6) have been associated with the oxidizing agents used in the bleaching process.
Traditionally, scientists have attributed coral declines after mass bleaching events to the bleaching only," said Marilyn Brandt, a post-doctoral researcher at the University of Miami and the lead author on the research paper.