I've had some severe tooth infections where dentists told me extraction or root canals were the only possible treatments. I used oil a regimen of oil pulling with antibacterial oils to kill the infection and bring my teeth back to normal each time.
Oil pulling is great at removing bacteria in the gums and roots - and it's very inexpensive. Plus it's easy to do and has other excellent health benefits. Check out the oil swishing/pulling forum. I killed my infections with a few drops of oregano oil in coconut oil. Plus I swished around some Colloidal Silver . Worked every time.