The iO 5 electric toothbrush features Oral-B's best technology combining a dentist-inspired round brush head with micro-vibrating bristles for a professional purifying clean feel at home. The Smart Pressure Sensor helps prevent you from brushing either too hard or too softly to better protect your gums. A.I. Brushing Recognition recognizes your brushing style and guides you to better brushing every day. Connects to the free Oral-B App for real-time brush tracking & guidance across 6 brushing zones. Oral-B iO toothbrush heads should be replaced every 3 months for optimal results. This toothbrush offers 5 cleaning modes: Daily Clean, Intense Clean, Sensitive, Super-Sensitive, and Whitening. The iO Lightring Timer ensures a dentist-recommended 2-minute brush and alerts you when a refill is needed.