Yes, they fit. We often have only one handset with us when we travel with 4 people...

Because children's mouths and teeth are smaller than adults', the Sonicare for Kids has a smaller deflection angle than the Sonicare for adults.

In principle, all replacement brush heads from Sonicare are compatible with all Sonicare handpieces, to the extent that cleaning heads "for Kids" can be attached to the Sonicare EasyClean. However, we would like to point out at this point that only the Sonicare for Kids should be used for cleaning small children's mouths.