Also electric toothbrush users can now switch to more environmentally friendly dental care with confidence. These plant-based replacement brushes are compatible with most Oral-B electric toothbrushes. The attachment mechanism, stem and bristles are made entirely of plant-based bio-plastics. Only the moving central part inside is still made of traditional petroleum-based plastic, which is necessary due to the high stress on this part. However, this part represents only about 10% of the total replacement brush. The package contains 2 spare brushes. Compatible with Pro, Trizone, ProfessionalCare?, ProfessionalCare? Smart series, Healthy Clean?, Vitality?, Pro-Health?, Oral-B Triumph?, AdvancePower (Oral-B?, ProfessionalCare?, Vitality?, Healthy Clean?, Pro-Health?, Oral-B Triumph? are registered trademarks of Procter & Gamble Business Services Canada Company).