The WUNDERBRUSH for GUMS is the                 first true Sulcus Brush! 
It combines an offset head - to eliminate "incisor impedance to lingual sulcular brushing", (DeRicco 2018), a single row of bristles - for laser-focused precision and entry into sulci, and a 45 degree bristle offset - relative to the handle, to help guide the bristles subgingivally, in "The Perfected Bass Technique"!