The whitening process which is performed on the teeth connected to live nerves is known as vital whitening. Vital whitening is generally performed in the dental clinic where the dentist can easily use powerful whitening gel and specialized light or laser that makes the bleaching faster. In-Clinic whitening will take around 60 to 90 minutes and the dentist will ask you for 2 or 3 more visits.
The tooth which has gone through root canal treatment and doesn’t have any live nerve connected are perfect for non-vital whitening. But this type of whitening may not improve the appearance of a tooth as the stain is coming from the inside of the tooth. So, the dentist will prescribe alternative methods to whiten the tooth from inside.