Not using an electric toothbrush. First time I used one it felt like I'd had a proper dental cleaning. An extremely half-assed effort with that kind of brush beats a thorough one with a manual brush. I thought they were a gimmick, but no, they're amazing.
Yup! Also the Phillips ones are just based on vibration (as opposed to some rotation in oral-b) which is also much better for your teeth and gums.
Why does a 3 year old video for repairing Sonicare toothbrush have 425K reviews on YouTube: https://www.youtube.com/watch?v=o3PBPU2jXbo, with 2.8K upvotes and 192 downvotes. It breaks because a screw goes loose inside the toothbrush.
I recommend you avoid Phillips electric toothbrush completely. I used a oral-B electric toothbrush for at least 8 years with no issues. And Phillips breaks in 6 months.