Does the Avent Niplette really work?

It does work. There've been instances when I would wear these for less than 8 hous a day, but mostly I try to put them on every day. I wear cushioned bra so they don't seem noticible. At first, nipples become sensitive and sore, but it gets much better over time as they get used to it.

How long should you wear Niplette?

The Nipplette should be worn daily, eventually for at least 8 hours per day 7 days a week and success is usually within weeks. If at the end of the treatment the nipple starts to retract, the device can be worn for a little longer.