It’s a great product. It has helped untangle my cats mats. I had tried other products that didn’t work.
My little yorkie’s hair under her eyes and side of her face hey hard an hard to comb without causing her discomfort .her hair is easy to comb through with marshmallow dematt.
So far so good! It helped get the tangles out when used wet in the bath. I can't speak for heavy matts since I don't allow it to get that far. But I am happy and it smells great