Greenies For Dogs satisfy your dog's natural desire to chew. The consistency/ingredients have been shown to help reduce odors, control dental tartar (calculus), strengthen gums and diminish oral bacteria. All ingredients in Greenies the original smart-treat are highly digestible and, except for the palatability enhancer, are used in human food products. Greenies prevent buildup of dental calculus, are exceptionally palatable, highly digestible and improve digestibility of other foods. No Inert Ingredients! No Added Preservatives! No Artificial Colors! No Added Sodium Chloride! No Added Sugar!