Looking for dog food. I switched Rosie to Wellness Small Bites recently. I have been very pleased with it; however, I noticed her tear stains are really really bad right now. I was told it could be the food.

Does anyone have any knowledge of this being true?
If so, I am on the look for a good food again. I stopped at a pet store and was given samples of Taste of the Wild, Instinct, and Logic. Logic is what they recommend there.
They also sold me a facial scrub for her tear stains. Petco had nothing as far as facial scrubs. All they had was the bottles of tear stain removers. So, I thought I would try the scrub. So, any knowledge about a connection between tear stains and food?