Our case of the month for July involves a treatment to whiten a discoloured lower front tooth. We will often come across darker teeth when they have undergone a root canal treatment due to the loss of the nerve and blood supply. Often the degradation of blood products from the pulp tissue within the dentinal tubules cause the tooth dentine to be gradually discolour and give that inherent grey/ dark appearance. This can be quite unsightly especially on a front tooth. For back teeth, in almost every case, we will need to place a crown once a tooth has been root filled to maintain function. This will also improve the colour as the ceramic cover the dark dentine. However, for front teeth, crowns are not always needed as the access for the treatment is on the inside of the tooth and when done under microscope, can be extremely minimal. So how do we whiten the tooth?