Update - 3 weeks later
It's been 3 weeks since I started using this stuff. I have to admit, I was hesitant and wary. I mean, who wouldn't be?
Koji: he didn't have much build-up since he's a chewer, but I had noticed plaque on his front teeth. I figured I'd leave it there and see what happens. lol. I also stopped brushing their teeth (I do it about 2x week) just to see. After 2 weeks, the plaque was gone from his front teeth. Has not returned. The plaque on his back teeth is there, but not much. I brushed his teeth and most of it came loose.
Miko: stinky breath, plaque build-up even though he just got his teeth cleaned not too long ago. No plaque on the front half of his mouth. The back teeth did have build-up, but nothing major. I also used a scaler to remove what was on his teeth and amazing, it just came right off. If he was a chewer, it probably would've come off itself. Oh, and his breath stopped being smelly about 1-1.5 weeks ago.
They say it takes 4-6 weeks, but me and my co-worker are already seeing vast improvements. I am not going to brush for another 3 weeks to see what happens. After that, I'll probably go back to my weekly grooming routines (and brushing 2x weekly). Just like me....it's always those back teeth that give me the most problems. lol.