What Kind Of Dog Food Is Good For Sensitive, Older Teeth?

My wife and I adopted an English Pointer we named Nellie a few months ago from a local shelter. She is about seven years old. We believe she had it pretty rough on the streets, because she is missing some teeth, and her teeth are worn down.
We give both our dogs dry Purina Dog food. Nellie has never been a big eater, but we realized that the reason for that might be because of her teeth. We have been trying to find a dry dog food that will not cause her teeth pain when she eats. Any suggestions?

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