After 3 weeks the heads stop movement under light pressure. This defect is not isolated to a specific lot but happens with all Life Brand Oral B replacement heads. Real Oral B replacement heads still function as new well past their 3 month stated life.

In less than a month of usage the brush head came loose or was plain defective. A little pressure caused the brush head to stop the partial rotation. I mean very light pressure. The other heads seem ok but not sure they will last for three months. Yes it is supposed to have a partial rotation but this head had too much rotation which made it weak. At first I thought the battery was weak but compared to the other two it was definitely defective. I'm afraid to buy more and stick to the compatible Oral B brush heads.