Effectively clean teeth and gums High quality rounded DuPont Tynex Nylon filament bristles and light blue indicator bristles (including need for replacement) Colour coded: 4 different colours with 2 heads in each colour Nevadent Ultrasonic toothbrush Profesional Compatibles for NSLP3.7 A1, NSZB3.7 B2, NSZB3.7 B2, NSZD3.7 A1