That’s how she refers to toothpaste that is too powerful. I’ve been reminded of this because I have been occasionally using a brand that has shocking oomph to it. It burns my mouth, much like a mouthwash. After brushing my tongue I have to douse my mouth with water, which I usually don’t do after brushing. I just spit. I don’t rinse. I don’t know why I started doing this, but now it’s a habit, a ritual, a routine.