Sonicare for Kids: HX6311 HX6312 HX6320 HX6321 HX6322 HX6330 HX6331 HX6340. • Indicator bristles fade to signal when to replace. HydroClean: HX6411/02 HX6431. ProtectiveClean: 4100/4300/4500/5100/6100 series HX6800 HX6807 HX6810 HX6817 HX6871 HX6876 HX6877.
