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Dentists recommend replacing the nozzle every 1-2 months, which can be purchased by clicking on the link: buy the nozzle of J110: Powerful cleaning up to 31000 strokes per minute     6 HOURS CHARGE FOR MINIUM 15 DAYS USE      Imported food grade DuPont brush, anti-shedding, anti-scattering, rounding process 2 minutes auto timer, 30-seconds intervals to ensure thourough brushing in four quadrants     IPX-7 waterproof to be used at bath and shower     FAQ Address And Full Name: 1.Please make sure your address in is matched with your shipping address before you pay. 2.Russian buyers, please leave us your full English name (mostly includes 3 words), which is very important. About Packaging: 1.The outer packing of each batch of products may be different, and the specific one is subject to the actual one received. 2. We will carefully check your order and the package to make sure everything is in good condition before shipping it out. 3. The packages may be slightly damaged during long-time transportation, but it doesn't affect the effect of our products. 4.If you want products packed perfectly (such as for gifts etc.), please contact us first, we can send the parcel with special package to avoid damage, but you need pay some extra fee. About Shipping: 1.Usually we ship within 24 hours, and it needs almost 7-30 days from China to you. 2.As you know, the delivery time is depend on the shipping company, the air line, the custom and the local post office, so we are not able to control it accurately. 3.If the parcel has not arrived in expected time, please feel free to contact us, we will track it and handle it with you. 5 Star Review: 1.Your satisfaction and positive feedback are quite helpful for us.Please leave positive feedback and 5 stars if you are satisfied with our items and services.We will be appreciated if you can share it with your friends on Facebook or Twitter. 2.If you have any sestions with our items or services,please feel free to contact us first before you leave negative feedback.We will do our best to soe any problems and provide you with the best customer services. THANK YOU