Philips Sonicare DiamondClean Series 9000 Electric Toothbrush - Sonic Brush, Cleaner Teeth and Gums, 1 X C3 Premium Plaque Control Brush Head (Model HX9911/63), White : Amazon.co.uk: Health & Personal Care
Philips Sonicare ProtectiveClean 5100 Electric Toothbrush, Black, with Travel Case, 3 x Cleaning Modes & 2 x Whitening Brush Head, (UK 2-pin Bathroom Plug) - HX6850/39 : Amazon.co.uk: Health & Personal Care
Sonicare toothbrush teardown: microcontroller, H bridge, and inductive charging
Philips Sonicare repair: Loud rattling noise, Head loose - YouTube
How to fix your Sonicare FlexCare Toothbrush - YouTube