Brushing won't remove tartar that is already there, however, it will prevent additional build-up. I know sometimes people don't see immediate results and think that their efforts are wasted. However, brushing is really the best thing you can do! You just have to make it part of your routine...I brush my dog's teeth right after I brush mine in the evening. It's easier to remember if you associate it with something else you do everyday. It only takes 2 minutes per dog!

Most dogs will need a dental cleaning at some point in their lives, but I'm sure whatever tartar she has now does not warrant one at just a year old.

I really have no idea as to whether she has a deformity. Dogs are individuals....and a result some chew more, some accumulate more tartar, etc. If you are worried, then describe your worries at her next vet visit and make sure your vet looks in her mouth.