I'm so glad you started this thread! I was just getting ready to do the same!
I need to start doing something for their teeth and I think Petzlife is going to be the next thing I try. I've tried brushing A.J's teeth before and he hated it! I also bought a "tooth brushing-toy"...like a bone shaped chew toy with bristles on the end...he hated it, it just made his gums bleed
I think I'm going to start with the gel and see how that goes...Now, is there anyone on here that sells it for a good price?