Hard and crunchy biscuits can play an important role in helping to maintain clean teeth and fresh breath. As your dog chews, the hard and crunchy texture of biscuits can help remove residual food particles and debris on your dog's teeth that can promote bad breath. Not only will your dog enjoy the great taste, but as part of a healthy diet combined with regular veterinarian care, biscuits can be part of your dog's oral hygiene regime.