After... it’s such a waste if you brush it only to have OJ with your jam toast... all that sugar on your teeth, the acidity of the OJ, the pieces of toast wedges between your teeth... especially if you’re having tea or coffee, it doesn’t make sense.
I have breakfast, I brush, I have tea then lunch and chew gum/brush again if I can, after this I stop caring but maybe have gum here and there till bed time when I brush again.
Oh yeah and brushing before ruins the taste of breakfast, try brushing your teeth with mint flavour toothpaste (I say that like most aren’t....) then try and drink some OJ.