The way that our gel works is that it prevents the buildup of bacteria that eventually results in plaque and tartar. It does this through enzymatic activity that cuts the bonds between molecules that stick together to eventually form the bacterial mass. For the enzymes to activate there needs to be some friction, which is generated by your dog chewing on something like a toy, bone or treat. That extra daily chewing will create a similar effect as brushing, but the gel will do much more than that.
All that said, Chompers Club is intended for daily use and to replace the need for brushing with a toothbrush. In order to effectively replace a brush, you just need to ensure that your dog is chewing significantly on either a toy or a treat/bone when they have the gel in their mouth.
You can always decide to brush in addition to that if you'd like, but it shouldn't be necessary.
One more thing to mention. If your dog already has significant chunks of tartar in their teeth, you need to get those chunks out with a professional cleaning. In this case regular toothbrushing will not get those out. After the cleaning, if you use our gel, the plaque and tartar will now have a much harder time building up again.