Teeth whitening is a common cosmetic dental procedure that uses oxidizing agents like hydrogen peroxide to lighten tooth color. There are two main whitening methods - an in-office treatment that uses a high concentration of peroxide for a short time, or a take-home treatment involving wearing a low concentration of peroxide for several hours a day over 5 to 14 days. Both work by the peroxide entering the tooth structure and oxidizing internal stains. While whitening can significantly lighten many stains, some like tetracycline staining may be resistant and require prolonged treatment. Side effects can include temporary tooth sensitivity. Faded results may fade over time as well.
Teeth whitening is a common cosmetic dental procedure that uses oxidizing agents like hydrogen peroxide to lighten tooth color. There are two main whitening methods - an in-office treatment that uses a high concentration of peroxide for a short time, or a take-home treatment involving wearing a low concentration of peroxide for several hours a day over 5 to 14 days. Both work by the peroxide entering the tooth structure and oxidizing internal stains. While whitening can significantly lighten many stains, some like tetracycline staining may be resistant and require prolonged treatment. Side effects can include temporary tooth sensitivity. Faded results may fade over time as well.
29. 活用例:新聞記事
Who 誰が、誰にNECが
What 何を水道管の漏水を!
29
遠隔で検知するサービス
When いつ2018年3月期の!
売り上げとして計上
Where どこ世界10カ国以上
Why なぜ水道管の老朽化を!
原因とした事故が増えているため
How どうやってセンサーで集めた水が流れる音を!
もとに漏水箇所を発見