Extra care for sensitive teeth: the S2 Sensitive brush head features 3,000 densely packed, ultra-soft bristles that help you remove 10x more plaque¹ Next-Generation Sonicare Technology: a gentle & effective clean − even in hard-to-reach areas; Sonicare Fluid Action supports the bristles by driving fluid deep between teeth and along the gumline Helps protect your gums with a visual pressure sensor: a light ring gently alerts you when you're brushing too hard − simply ease off when it lights up, to keep your gums protected Personalise your cleaning experience with a sonic electric toothbrush featuring 6 brushing settings: choose between Clean & Sensitive modes, and pick 1 of 3 intensity settings The included travel case allows you to take your device on the go; strong enough to keep your Sonicare toothbrush safe, yet compact enough to slip into any bag, making it the perfect travel companion Guided brushing sessions: every 20 seconds, the BrushPacer will prompt you to clean a new area; after 2 minutes, the SmartTimer will indicate your session is complete Rechargeable electric toothbrush with 21-day battery life: experience up to 21 days of regular brushing after a single charge; USB-A charging (power adaptor not included) The set includes: 1x Philips Sonicare 6100 Series electric toothbrush, 3x S2 Sensitive brush heads, 1x travel case, 1x USB-A charger (power adaptor not included)