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Ultrasonic Dental Scaler For Teeth Tartar Stain Tooth Calculus Remover Electric Sonic Teeth Plaque Cleaner Dental Stone Removal. Dear friends, our product is very hot selling, now let me answer some questions from the buyers. Q: The product doesn't vibrate after turn it on?. A: The product adopts ultrasonic technology, and the product itself won't vibrate after it is turned on. You need to install the cleaning head, use a small wrench to tighten the cleaning head. When the product touches hard objects such as wrenches, teeth, etc, it will make a sound, indicating that the product is vibrating. No sound or vibration when the product touches soft objects such as skin and gums. Q: Cannot be turned on, cannot be charged, doesn't vibrate, missing accessories. A: When you encounter similar problems, please don't open dispute and don't give bad feedbck in advance. Please contact us Immediately, if the product has quality problems, we promise to resend a new product for you. Q: No effect after