Philips Sonicare DiamondClean Prestige 9900Rechargeable Toothbrush

What is Sonicare SenseIQ technology?

How do I know when to replace the brush head?

How do I charge my toothbrush handle with the travel case?

How do I charge my Sonicare 9900 Prestige handle on the charging base?

What do the symbols on my Sonicare toothbrush mean?