Root canal treatment of a tooth that has undergone a trauma and become non–vital is a common occurrence in any dental set up. During the root canal treatment, application of a rubber dam for proper isolation is also a well–established part of the procedure. However, in the present case, when the treatment was being done under rubber dam, the tooth in question spontaneously underwent avulsion. The occurrence of avulsion of a tooth on application of rubber dam is unheard of with no reference in the literature regarding the same.

Hence, in this article, we are discussing a case where such an incident happened. Though being baffled by the occurrence, we then completed the treatment as a case of avulsion according to the IADT guidelines. The tooth was replanted and splinted. The tooth now shows no increased mobility and is completely asymptomatic.