
The brush head stops vibrating at the slightest pressure on the teeth. The brush handle still vibrated, only the connection between the brush head and the handle bracket may not be strong enough. These nozzles do not have a metal inner ring on the underside of the nozzle. Not sure if this is a problem. The aftermarket head (with metal ring) that he was supposed to replace worked fine, so I know it's not a grip issue. i give them back I do not recommend these heads. Sad because I liked that they packaged them with white and black tips.

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