Keep going, it really works
My dog had bad scale and sore gums (has very bad jaw alignment, and seems to build-up scale quickly - noticed on checking one day, felt terrible). Have been working away 2-3 times a day, and after few weeks her gums are now calm (for gums, I use alcohol free human chlorohexidine mouthwash too, as recommended by vet), several of the really bad teeth almost scale free, the very worst ones getting gradually better - I see more white tooth each time. Luckily for me, she is fairly tolerant. Once clear, I will keep brushing her teeth daily and using Fortan couple of times a week as needed.