Ultimate Clean iO brush heads - how long do they last for you?
I'm using an iO 7 in daily clean mode and 99.9% of my brushing is in the "green" pressure range but the brush heads don't seem to last anywhere close to 3 months. After about a month they are starting to look ragged. I buy the Oral B branded heads at BJs and they come in a 8 pack and believe they are authentic.