EasyClean (HX6511/50)

I can't speak to the 6100 specifically, but I got the HX6530 over 5 years ago now, and I have been more than happy with it. Heads are easy to replace, the charge has never been a problem once, and I have noticed any significant difference in the motor over time either. Presuming other Sonicare brushes have similar quality control, and can at least confirm that if you're happy with it at the start, it will likely last while keeping functionality.

We started using ours in 2011. Still going on the original motor and battery. I had to replace the seal around the motor shaft where it protrudes through the top of the body because the original had a design flaw and it tore after 4 years or so, but that’s been it. I have a spare rechargeable battery on standby just in case, but I’ve never charged it since I bought it ten years ago, so I doubt it would even take a charge at this point. Not upset that I’ve never needed to install it though. That toothbrush is a beast!

The newer ones perform as well but don’t seem to last nearly as long. Clean the old one, it’s not difficult. Then make a point of taking the head off after post-use rinse so both pieces can dry separately. That’s important.

Been using a basic Sonicare for like 4 years now and it's been solid. The battery thing is legit - still goes forever between charges. I tried the Oral-B at my dentist's office and it felt way more aggressive, almost like it was gonna strip my enamel off lol For what you want I'd just get the cheapest Sonicare model, the expensive ones mostly add timers and pressure sensors that you honestly don't need

Mine broke before two years and I went back to my old one that was the basic Sonic. The earlier ones last way longer.

Laifen's toothbrush is solid if you liked the hair dryer, and it's in your budget. But honestly, for the price you'd probably be just as happy with an Oral-B or Sonicare basic model without the Bluetooth stuff. The key thing is replacement heads - Oral-B originals are cheap and everywhere, which saves you money over time. Avoid anything with a proprietary head ecosystem unless you're okay with vendor lock-in. For a water flosser in your budget, Waterpik makes the standard ones and they're reliable, though honestly a regular flosser works fine too if the dentist will accept that.