I have tried a lot of products and the very best is a weekly or bi-weekly chew session with a quality bully stick (low odor, USA sourced). My shepherd was horrible horrible and now is quite good, good enough to not need a cleaning. Melli sheltie came to me 2 years ago having just had a dental through the shelter. Her teeth are perfect. Cubs is a year and his are nearly perfect too. However, before offering a chew item you need to know there are no loose or abscessed teeth (etc.).