I still do ozone injection above number 8. Ozone injection will find the nearest infection-so an injection at number eight often I feel pressure in frontal sinus. I also do ten pass ozone and sauna.
There are some great lectures on youtube about ozone for dental.
My impression from the dentist was that he would remove the amalgams and any additional decay in the area, treat the surface area with ozone, and then put a composite filling in. I don't think he was referring to any kind of injections.