Yes, I had really bad teeth and still do except that they are better now.
I had several root canals
then I was younger and these have gotten infected on several occasions. In my experience, using the zapper has helped the swelling and pain as well as other symptoms of infection.
If you still have bad breath, it could be either that there is still decay that needs removal or the bad breath could be a symptom of other things, coming from your lungs.
It is a good idea to see a holistic dentist.