Once the nerve dies, the open pulp canal is an area that food, saliva, debris, and bacteria enter the tooth resulting in an infection of the pulp tissue. (southernazvets.com)
Once the nerve dies, the open pulp canal is an area that food, saliva, debris, and bacteria can enter the tooth resulting in an infection of the pulp tissue. (thepetdentist.com)
The other way is to use a live virus that has been modified such that actual disease does not result in infection. (vin.com)