I purchased and have just received 4 rechargeable Electric Tooth Calculus Removal Tools. One of them fell apart as I lifted it out of its box, The break revealed there to be a pencil lead thick clear plastic spine which is caused to vibrate and passes the vibrations to a pointed "needle" type tip at the head of it. I used one that was working. You hold the needle vibrotip onto your tooth enamel so that vibrations act to "shatter" calculus build up. Well...it works in a fashion on very minor calculus buildup, but not on really caked up calculus such as builds up behind lower front teeth. I thought using it would save me from a painful dental oral cleaning.....IT WON'T ! The Sales pitch used by the company is persuasive..especially the "Buy two get one free" come-on. At best it's a toy and You will definitely need your Dentist to do a proper job for you. Having read the scam reports about CuJia, I won't bother trying to get a refund on the broken one. LESSON LEARNED.....and YOU now stand warned about them!
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