Q. I chipped my front teeth as a teen ager and got three caps. Over time root canals were done. One root canal was done nearly 30 years ago in Hungary with some mysteriouis metal. The caps were replaced over 15 years ago and it is important to redo the root canal treatment. My dentist suggests laser treatment and then filling the roots with some rubber substance or a rubber substance with gold tips. What are the advantages and disadvantages of adding the gold tips to the roots? I would think that the less metal in our mouths the better.