I looked into this also and it looks to be a garbage vaccine....this vaccine doesn't really accomplish much because a person still has to do regular teeth care at home and regular vet cleanings .........
This vaccine also has formaldehyde in it which is highly toxic and a cancer hazard.....
These people have had terrible problems with it.....
We Just Had Our Yorkie Vaccinated With The Porphyromonas Vaccine For... - Blurtit
.....Personally I would pass on this.....Just not worth it.....