If your dog has tartar and things are bad enough she is loosing teeth, she needs to see a vet for a cleaning. All that nasty gunk can enter the bloodstream and shorten your dog's life.
I have had dogs loose a couple of teeth over the years due to accident. I don't normally brush but inspect, offer enough chew things to clean the teeth and occasionally have them cleaned.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles