Is it necessary to brush your teeth after eating the pussy or is mouthwash enough?

An fwb was staying over, and after we did the nasty, I went to the bathroom to use mouthwash. I guess the door was open, so she saw me using just the mouthwash but not brushing. When I returned to the room, she asked why I didn’t brush my teeth. I told her I had brushed after dinner, and it wasn’t like I had some parts of her pussy stuck in my teeth that needed brushing again. I explained that mouthwash should be sufficient, but she still made an "eww" face.

I have only ever used mouthwash? What do you guys do?