I recommend the “touching exercise” first. After you clear this exercise, you can start The Advanced Exercise of putting your finger into your dog’s mouth. Then you can start dog teeth brushing.
Use careful, gentle movements throughout the exercise, and try to be positively involved in the process, making your dog think this is fun or pleasant.
Remember, your dog takes most of its cues from you, so if you act like you can’t wait to finish, your dog will feel the same way.
1) First, open the dog’s mouth. When you can do it, praise your dog a great deal.
2) Touch the side of teeth for a second with your finger. When you can do it, praise your dog passionately again.
3) Gradually touch its teeth for a longer time and cover more teeth.
4) Next, wrap your index finger with a piece of wet cotton gauze and touch exercise with it.
The area you should touch is rather the base of teeth or gumline than the teeth surface.
5) Massage gum line with it.
6) Apply some wet baking soda paste on the cotton and do the exercise. ( Baking soda is not always necessary. If the stain is heavy it helps. )
Try cleaning outside of the teeth row and gum line which is the area where most tartar build-up. That’s good enough.
Now your dog’s teeth are much cleaner!