I have three yorkies.
Teddy is only 2.5 years old and he has all his teeth
Barney is 11 years old and he has all his teeth
Daisy is 11 years old and she is a jack-o-lantern
Brushing at home daily is by far the best you can do for your dog, along with annual vet checks and dentals if warranted, so it is great that Bella is a big fan of brushing! Congrats.