I also use the Petzlife Life for Teeth spray and my almost 2 year old has no tartar whatsoever. I don't brush
but I do feed mainly dry food. I have also been using it on one I got as an adult with tons of tartar and her teeth have improved dramatically. I am still planning on taking her in since she also still has baby teeth that need to be removed
, but it did definitely help and with continued use I feel it probably would avoid the cleaning all together, if not for the retained baby teeth needing to be pulled.