I brush my teeth after, as it does mess up your mouth doesn't it.
It helps to take a sip of water and keep it in your mouth, take herb, then follow with more water.
The dry powder can get in your lungs making you cough, i've done that a few times. By wetting the herb in the mouth it stops that happening.
You could buy caps and make your own capsules if you are one of those people that find it really difficult to take herbs straight. My husband is one of those people. He can't swallow caps or pills either without a problem, he just gags. I think with him it is psycological.