Dogs gums problems are just like people. If your don't get the tartar off the gum to tooth area it will make the gums red and sore and gingivitis will set in and cause very yucky breath. Your dog will feel like an old dog fast if infection starts in the gums For sure your dog won't want to chew with his gums hurting and bleeding. He needs a cleaning professionally done and then talk to the Vet about maintenance. Sounds like you love your dog a lot so make him feel better!!! Blossom