Perfect is the second that I buy... I buy one for myself because I do a lot of tartar in the front of the teeth... at first I had a thing to use it because I saw it very powerful and it gave me afraid to spoil the tooth… but once I learned I see the Tartar come off the front lower paddles (Where I have visibility in the mirror) there is only to use it on the Tartar plate…. Where you have enough... to avoid doing damage to the tooth I recommend not to use it on top of areas with very little tartar... you rest it on top of the plate at the minimum speed supporting slightly and you will see how it comes off the tartar with ease