Your teeth are not separate from the rest of you. Infection, inflammation, dead or poorly treated tissue in the mouth can burden the whole body. Problems in a tooth can show up as trouble elsewhere in low energy, organs, immunity and things that look unrelated until you connect the dots. 
This is not a theory to me. It is a cautionary tale. Someone I know had a root canal that got infected. Within a year they had cancer. About three months after that they passed away.  I know this wasn't coincidence. 
I am not saying every root canal ends that way. I am saying an unresolved infection in the jaw is not a small local problem. The body has to keep fighting it as gland and lymph systems cycle through the mouth. If your teeth have issues, don't treat it like a minor dental issue. Get it looked at. Do not let infection sit in your mouth.
Much Love, 
Lynn