My son is in Federal Prison in Phoenix AZ for growing medical marijuana in California and had a root canal done before his incarceration. He was not able to get the crown completed prior to his self surrender dated. FCI will not do a Crown but they will apply a regular filling. Will that be sufficient for now or is he better off not doing anything and wait till he is released in about 20 to 26 months? He is concerned about the ntooth being weak and breaking or cracking.