SAFE & PROTECT YOUR GUMS - This electric teeth cleaning kit only works on teeth or hard objects, it stops vibrate when touch gums, which protected your gums. Some customers may think that the dental calculus remover is not working because it has novibration, we suggest you charge it fully and try it on hard object first. It suits people over 16 years old. HIGH-FREQUENCY VIBRATION - This plaque remover for teeth can effectively remove dental plaque, tartar and teeth stains. With high frequency vibration technology to effectively reach into those hard spots and corner.It is recommended to use gentle modefor cleaning at first time. 5 MODES & 2 REPLACEMENT HEADS - Our tartar remover has 5 working modes for different sensitivity of gums, to meet different needs. And the dental calculus remover is with 2 replacement heads, tip cleaning head is used to remove calculus, plaque andstains between teeth and around gums, flat cleaning head is used to remove large calculus and plaque on the surface. USB CHARGING & LED LIGHT - This electric teeth cleaner is powered by Type C USB, it is convenient to recharge with power bank, PC, phone charge at anytime. LED light and dental mouth mirror help you find calculus in your teeth more easily and removethem efficiently. Automatically turn off function helps improve safety and extend machine' service life.