Trisa Profilac Complete Medium Toothbrush 1 PCVelvet like thumb rest guarantees a safe hold; for an intensive care and cleaning of hard to reach areas,in between the teeth along the gum line,the tongue; trisa bristles are of special filament named tynex which combines nylon(612) in a special formulation to deliver strength, stiffness, durability, moisture resistance (even in a wet condition)