Because pulp tissue has been removed from the root canal treatment, the deadened dentin may darken over time. In these cases the choice of treatment may be the internal whitening or internal bleaching. For tetracycline staining external whitening can be used.
Internal whitening involves placing a bleaching agent into the pulp chamber inside the tooth. Since the chamber is now empty, the bleaching agent will fill in the gaps and help to prevent the tooth from discolouring. It is a completely safe and effective procedure. Once the bleaching agent has been applied, dentist will cover it with a cotton pellet. A seal is then required to prevent leakage. It takes some times to achieve a desirable result. For brownish yellow discolouration external whitening procedure can be applied. In this procedure either dentist places a suitable agent on the tooth surface in dental clinic or the dentist might give a home bleaching tray with some bleaching agent. In home bleaching technique patient has to self-apply the bleaching agent onto the teeth surface.
Tooth whitening often takes a considerable time to have its effect and patient may has to visit several times to dental office to achieve desirable result.
Side effects of this bleaching may include gingival irritation or at times sensitivity to adjacent tooth.