I know that acid is bad for teeth, but I would think that brushing after drinking lemon juice or having acid reflux would be a good thing, since you're diluting the acid immediately just by the water and paste on the brush, and you're immediately rinsing everything out of your mouth afterwards.
Maybe brushing without paste would grind it into the tooth enamel? If I brush, I always use paste, or at least something like coconut oil on my brush.
I drink lemon water and baking soda every morning and never brush afterwards. I don't know about this, no expert here, but I won't let it affect when I brush my teeth.
