
Philips Sonicare
ProtectiveClean 4100
Affordable, durable, great clean; strong vibration and magnet issues.

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I don't know about the other brands - but I've been using my Oral-B professional care with smart guide since about 2005. Still going to this day, but I don't know how things have gone with them in the past 20 years because I haven't had to think about it...
That’s frustrating , I’m pretty sure they’re all waterproof! I’ve had my Oral B Triumph for 15 years and it’s going without issue.
Oral-B Vitality is good, costs about 1.5k. The more expensive ones have fancy modes which are honestly useless. However, I will recommend you to get one with a pressure sensor. It helped me apply the right pressure, saving my enamel in the long run. You might also want to consider battery life if you plan to travel without carrying the charger. I have the Oral-B Smart 7 which can go for like 5-7 days on a full charge. Do NOT go for the one with the AA batteries that cost about 500, they don’t clean very well.
I purchased the Oral B 7 series after reading about it in Consumer Reports. It makes my teeth feel really clean like after you’ve been to the dentist. I previously used a Phillips Sonicare. Search around for the best price. I found the best price at Target.
I have a 3757 which looks the same as yours but is much cheaper. It probably is legit the same toothbrush with yours having some marketed extra to push the price point 4x higher. Mine is always dripping water so I bet my handle has the same problem
I don't recommend the brush heads with the little yellow "flossing" paddles. Beat the hell out of your gums. Whether you get the pro or the iO you'll want to use soft bristles. I have an io myself. I like it, but it's true that mold is a concern. You have to stay on it.

Philips Sonicare
ProtectiveClean 4100
Affordable, durable, great clean; strong vibration and magnet issues.

Philips Sonicare
4100 Series
Affordable, durable, great clean; some find vibration unpleasant.

Oral-B
Pro 1000
Affordable, effective rotating clean, but loud with poor battery.

Oral-B
iO 3 Black Electric Toothbrush
Exceptional clean, gentle, but mold-prone with pricey heads.

Philips Sonicare
ProtectiveClean 6100
Gentle, advanced clean, good value, but bulky travel case.

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Autobrush - Sonic Pro Electric Toothbrush

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Philips Sonicare - Philips One Rechargeable Toothbrush

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Oral-B - Pro 1000

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Philips Sonicare - ProtectiveClean 5300 Sonic electric toothbrush

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Oral-B - iO 3 Black Electric Toothbrush

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Oral-B - iO 3 Black Electric Toothbrush