Celiz and his fellows have developed a new filling made from synthetic biomaterial that can stimulate the growth of stem cells in the pulp of the tooth, which can be injected into the tooth like a regular filling and hardened with UV light. In the future, Celiz says, all fillings could be made of such regenerative material so that damaged teeth could heal themselves, lowering the failure rate of fillings, and potentially even eliminating the need for most root canals. What do you think?