noun, noun or participle which takes 'suru'
Commonly used in beauty and dental contexts for teeth whitening treatments or products. Can also refer to skin whitening, but teeth is the most typical association.
歯のホワイトニングをしたいです。
I want to get my teeth whitened.
この歯磨き粉にはホワイトニング効果があります。
This toothpaste has a whitening effect.