Internal and external tooth bleaching are two different procedures used to lighten the colour of teeth, but they target different aspects of tooth discoloration

This procedure is typically performed on a tooth that has undergone root canal treatment and has discoloured with age.

Discoloration from internal haemorrhage of the pulp can lead to changes in tooth colour stemming from the breakdown of blood cells or other organic matter.

Trauma can induce accelerated aging, causing a visible discrepancy between the affected and unaffected teeth.

Internal bleaching involves placing a bleaching agent inside the tooth to lighten the discoloration from within and can only be undertaken on successfully root treated teeth.

The procedure is usually conducted in the dental office, where the dentist will drill a small hole into the tooth and apply the bleaching agent directly inside. The access hole is then sealed to prevent bacteria contamination and bleach leakage.

Several sessions may be required to achieve the required level of whitening.

External tooth bleaching, also known as teeth whitening, is a more common procedure aimed at removing surface stains and lightening the overall shade of teeth.

This procedure is typically performed on teeth that have become stained from factors such as coffee, tea, tobacco, or natural aging.

External bleaching involves the application of a bleaching agent, usually carbamide peroxide, directly onto the surface of the teeth.

External bleaching can be done in a dental office or at home with the aid of customized trays provided by a dentist.