Philips Sonicare - DiamondClean Smart 9400 (HX9917/89, HX9918/89, etc.)
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Based on 1 year's data from Mar 20, 2026 How it works
Background-Camel-713 1.0Not sure which route you’ve went, I’ve had 3 9400’s , one 7400 and currently I have the cheap one, I hate it , it’s not near as powerful, they don’t last long in general, but a good toothbrush feels so much better, I recommend spending the money and don’t expect it to last long, I’m lucky to get a year out of one
Bose321 1.0I really wonder how you can break them that much. Me and the wife are using a 9400 for years without any issues.
dot-M 1.0My two Philips Sonicare DiamondClean Smart 9400 for German market are made in China. Also we have a chinese made Sonicare 5100
ComeHereOften1972 0.4Black Sonicare herrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrre. It’s goooooooooooooooooooooooooooooood
Nancy6651 0.3I've been using Sonicare toothbrushes forever. I usually get the package of 2 of them, in case I can convince my husband to use one (unsuccessful so far) or for travel. I like the one I have now since it has more "intelligence" and lets me know when to replace the brush head.
lumixjourney 0.3I had one of the old diamondclean models and it stopped working so i ordered a new diamondclean model from philips which was useless - i ended up buying the older model from aliexpress and it worked perfectly
ponytrack 0.2Bought the highest end sonicare set three times. One of the two always developed really loud buzzing sounds. Theoretically it could be fixed, but I opted to return and replace. After using sonicare for 15 years, what back to oral b. Design isn’t as slick, but works great and was way cheaper. We’ll see what my dentist says in six months.
nanomax55 0.1Sonicare diamond clean user here. Going strong 4th year. Before the black redesign i had the white one. It worked great no issues but the power button seal broke and I started getting water in so I replaced it.
50bucksback 0.1I am not a fan of the vibrations of the SonicCare. Much prefer the oral-b heads and how it functions. I also like that after the 2 minute time it keeps going so I can get my tongue. I don't think either one is really better. Do it based on replacement head cost.
accordingtoame 0.1My newer one is a diamond clean and is going very strong. I have no idea what the other one is, it’s a million years old
I have no idea. I bought it like 3 years ago by now