The C.i. Endcleaner Brush is ideal in cleaning the back portion of the last teeth (most difficult part of the mouth to clean. Can also be used on the upper / lower teeth; front / back surfaces beside any missing tooth (the brush adapts to the contour of the tooth). May also be used even with small mouth opening. Colours: White and Blue Promo: Includes 1 FREE 2-brush travel case, while supplies last!