Currently, there are NO products that will do this safely. There can be many causes however it is quite often an internal alkalinity issue that surfaces on the outside. Over the years we found that the only way to get rid of tear stains in our Show Dogs was by adding 1 Teaspoon of natural Apple Cider Vinegar to the food once a day. Maybe not the most delicious sounding, however the dogs get use to eating it. The vinegar counteracts the natural occurrence of the staining.