I have been using Petzlife gel for about six months. After obtaining some information from YT, I am very concerned. Ellie May's mom noted that the second ingredient in Petzlife is grain alcohol. I checked my bottle, and it is. That really concerns me. Now that I think about it, Prince has vomited a few times after having his teeth brushed. I usually mix a little Petzlife with his C.E.T. toothpaste, and sometimes I use Petzlife alone. I'm seriously thinking about using C.E.T. only.
I found this website that you may find interesting. I'm not sure if it's a little biased.
PetzLife Products Inc - Products For a Healthier Pet