I found this information and decided to pass it on.
"As far as the PetzLife product goes, I'd be more concerned about the essential oils than about the grapefruit seed extract, which is safe as far as I know (though its supposed antibacterial effects are not supported by studies, as Ruthe wrote). I think I'd take the competitor's warnings with a grain of salt, but rosemary oil can lower seizure threshold in dogs prone to seizures, peppermint oil is contraindicated for dogs with reflux, I don't know about the other two. It bothers me that they don't have a full ingredient list, they just talk about certain specific ingredients. Several oral care products for dogs have turned out to use xylitol, which is toxic, so I'd watch out for that.
PetzLife has also been discussed in the past and again, some people reported trying it without success, see replies where applicable:
http://onibasu.com/archives/kn/158962.html http://onibasu.com/archives/kn/131643.html http://onibasu.com/archives/kn/129819.html
I'm pretty much a believer that if something seems to good to be true, or makes a lot of unsupported claims, it's not a good sign. I usually don't end up trying products like that.
Mary Straus
www.dogaware.com"