Both GC Tooth Mousse (Recaldent) and Toothmin Tooth cream (Abbott Healthcare Pvt.Ltd) increase the microhardness of bleached enamel. Toothmin tooth cream is a better agent for increasing microhardness, although difference is not significant.

It is usually believed that root canal therapy fails because of failure to follow treatment protocols. However, sometimes even after following the highest standards of treatment the outcome of the therapy is not good. The cause for this might be intra radicular or extra radicular. Clinicians mostly concern themselves with the root canal only and forget the periapical area. The aim of this review is to discuss the commonly neglected extra radicular causes of root canal therapy failure.