What Causes My Eyes To Get Red After Brushing?

Factual Questions
1

When I brush my teeth in the morning, I make it a habit to brush my tongue as well. Unfortunately, this usually causes me to gag.

Afterwords, I look in the mirror and the whites of my eyes appear to be very red- much more so than they were just prior to brushing. Why?

Am I doing myself any harm?

Thanks.

2

What causes my eyes to get red after brushing?

Well, then maybe you shouldn’t brush your eyes!

(Sorry, couldn’t resist after seeing the thread title. I have nothing helpful to say about the question.)