real chicken is always #1. no corn, wheat or soy. support your active dog's whole body health with purina one. are acidic... most of the time people are shocked when we show them where they're getting the acid, and what those acids can do to the enamel. there's only so much enamel on a tooth, and everybody needs to do something about it now if they want to preserve their teeth. i recommend pronamel because it helps strengthen the tooth and makes it more resistant to acid breakdown. we want to be healthy and strong through the course of our life, and by using pronamel every day, just simply using it as your toothpaste, you know you will have that peace of mind.