Philips Sonicare DiamondClean 9000Rechargeable toothbrush

How does the brushing guidance work in the Sonicare app?

Can I sync the Sonicare app with the Apple Health app?

How do I enable or disable the pressure sensor on my Sonicare?

Which brush head fits my Sonicare toothbrush?

In which countries is the Sonicare app available?

My brush head is difficult to attach or remove.