I’m shocked, because in my country every dentist would recommend you to do it 3 times a day, so hearing there are people out there only doing it as much as twice a day, with quite some people doing just once a day, it’s very shocking for me.
I gotta admit though that more often than not I don’t do it the afternoon because I either forget, or don’t have time to do it. But I do it religiously every morning after breakfast, and every night before I sleep.