The old root canal therapy caused this discoloration .
Internal bleaching was done for her in 3 session . As you can see the tooth became brighten about 3 degree in dental classification . Then the old composite filling of this tooth was changed into a new one and exactly the same color .
Internal tooth bleaching is essentially a teeth whitening technique that works from the inside
One potential side effect of root canal procedure is a yellowing or darkening of the treated tooth .
Internal bleaching is a minor procedure that fix this problem .
