Philips Sonicare DiamondClean Prestige 9900Rechargeable Toothbrush

How do I place my brush head in the traveling case?

What is Sonicare SenseIQ technology?

How does the brushing guidance work in the Sonicare app?

What features can I activate or deactivate from the toothbrush handle?

Do I need an Alexa device to reorder replacement brush heads for my Sonicare?