If it takes more than a week, continue doing it nightly until the gagging stops. Move your gag reflex trigger back further by extending the area that you brush. Brush 1/4 to 1/2 inch further back on your tongue. This new area is now your gag reflex trigger and where you should do your nightly brushing. Work on that area nightly until you can brush that part of your tongue without gagging.
Flowering Plants. The Division name Anthophyta simply means flowering plant; the other term, angiosperm, refers to the seeds being borne in a vessel called a fruit. The plant that you see is the diploid sporophyte.
(Living Stones). Lithops is a genus of succulent plants native to Southern Africa. Lithos means stone and -ops means face in Ancient Greek; therefore  Lithops  means stone-like. The formation of the name from the Greek ops means that even a single plant is called a Lithops. This is a very good description of these plants, which avoid being eaten by blending in with surrounding rocks.