A. Note: Non-original, suitable for brush heads B. The ultrasonic electric toothbrush can help remove dental plaque and reduce the risk of gingival necrosis. C. The 3D brush head has an appearance that fits the tooth surface, and its small and delicate design allows it to reach deep into the oral cavity. D. It uses 0.152 - millimeter bristles from DuPont in the United States. The brush head is certified by the U.S. Food and Drug Administration (FDA) and has been disinfected by ultraviolet light. E. It is vacuum - packed and meets medical safety standards. F. This type of brush head may be suitable for people who smoke or drink coffee. G. It is suitable for Oclean X/X PRO/Z1/F1/One/Air 2/SE electric toothbrushes. H. If you have any questions about the toothbrush model, you can consult the customer service. Thank you.