The Science of Scent Unleashed! Playology designs scented toys made from dog-safe materials that keep dogs engaged longer – 7X as long as an unscented toy. Our Dental Chew Stick has brush-like grooves that create a satisfying chew that massages gums and helps clean dogs' teeth as they play. Scientifically designed for senior dogs combining our engaging all-natural scents with softer materials for more comfortable chewing so they can keep playing longer even as they (and their teeth) age. Available in two sizes and two mouthwatering scents allowing you to find the combination that perfectly suits your dog's size and taste