Philips Sonicare Elite+Sonic electric toothbrush

How often should I replace my Philips Sonicare Brush Head

Which brands/brush heads fit in the Sonicare Sanitizer?

How do electric and manual toothbrushes differ?

How does the brushing guidance work in the Sonicare app?

Which brush head fits my Sonicare toothbrush?

My brush head is difficult to attach or remove.

I cannot connect my toothbrush to the Sonicare app

My Sonicare toothbrush is not vibrating

My Sonicare toothbrush is not charging

My Sonicare toothbrush vibrates too powerfully