DiamondClean 9900 Prestige Electric Toothbrush - with SenseIQ Technology and Advanced AI App, 5 Brushing Modes, 3 Intensity Levels, Charging Travel Case,Midnight Blue, Model HX9990/12

I'm just going to start off by saying this is my favorite toothbrush that I have owned so far, even if it is very pricey! Prior to this toothbrush, I have been alternating between an Oral-B electric toothbrush with a round head and a traditional toothbrush. The toothbrush arrives well packaged and is very easy to setup. I do use the app (iOS) while brushing my teeth. The build quality is top notch, it doesn't feel cheap. This should be expected being how expensive this toothbrush can go for. One of the reasons I chose this toothbrush over the lower models is due to its design and not having a physical button where grime can build up. The fewer crevices there are, the easier it is to keep the toothbrush clean and functioning properly. The charging puck is nice and works well. If I had any suggestions of improvement, it would be that the plastic piece that sits on top of the charger snap in place instead of just resting on top. It's so lightweight that and doesn't secure itself, that any attempt to move the charger or a bump to it can knock the plastic mount off of the charging puck. Other than that, the toothbrush sits securely and I haven't had an incident yet that could knock the toothbrush off. When brushing my teeth, I use the app and set the tooth brush to it's deep clean mode for a longer brush time. I can honestly say I don't recall my teeth ever feeling this clean from brushing at home. The closest experience I can compare it to is after having my teeth cleaned at the dentist. My whole mouth feels cleaner, my teeth feel smooth and polished, morning breath has been greatly reduced, and I have even noticed my teeth looking noticeably whiter as this toothbrush does an excellent job at removing stains (I don't smoke, but I do drink coffee and sodas). I was starting to notice this within the first 2 weeks of using the toothbrush and after about 1.5 months of use I still have the extra clean feeling after every brush and more stains have been removed from my teeth. The toothbrush is very easy to keep clean, especially with fewer crevices for grime to get caught up in. I also find that this toothbrush is less messy when being used, less drippage and such. My previous toothbrush, an Oral-B was horrendous for this. It had lots of crevices for grime to get into and the design of the brush heads allows toothpaste and saliva to drip down the handle. No such problem with this toothbrush. When I first got the toothbrush, one of my initial complaints was that it didn't allow me to capture my brushing data into Apple Health. But a few weeks ago Philips released an update to their app that does allow some data to be recorded into Apple Health, so that is a good start. Another complaint that I have which is related to the app (and how the toothbrush interprets input) is I sometimes run into problems with the toothbrush and app properly capturing the position and placement of my toothbrush. Even though I may be brushing in the area it wants me to, sometimes it has a hard time recognizing if I am brushing on the outside or the inside. When this happens, it may not flag enough time being brushed in that area and want me to brush for an additional amount of time to touch up those areas. And it isn't always the same area. This may be due to a calibration problem and it would nice if there was an easy way to quickly recalibrate the toothbrush so that it can better identify its position. On a side note, if you plan to use the app to track your brushing habits, I recommend getting something to mount your phone to your mirror. It will make using the app while brushing a lot easier. I do like how the app and toothbrush track the life of your brush head and recommends when it is time to replace it. Typical recommendation to replace a brush head is ever 3 months. I am currently two weeks away from 2 months of use and based on my current usage, it looks like I will be prompted to replace my brush head in about 2 weeks. So why am I getting about 2 months use out of my brush head instead of three? If I had to guess, it may be due to me doing the Deep Clean option which runs for 50% longer than a typical brushing session, 3 minutes vs 2 minutes. As such, the app and toothbrush may not be calculating my brush head use by number of sessions (like it displays it as) but really by how much time the brush head is used for. TL;DR The toothbrush is phenomenal but pricey. If you don't mind spending the money, or find it on sale, you won't be disappointed in the performance of the toothbrush. It does an excellent job at cleaning your teeth and removing stains. The app is decent, but there is always room for improvement. But seeing that improvements have already been made in the short time I have been using the toothbrush, I am hopeful that the app will continue to get better in the coming months. Adding an easy to use recalibrate option for its positioning awareness, I think, will be extremely helpful. I would also like to see more data being captured in Apple Health instead of just brush duration. The app captures a lot more data points that I would like be viewed in Apple Health as well. Not sure if this is a limitation with Apple Health or the app.

My dental hygienist recommended this toothbrush. After 6 months of use, the parameters for measuring gum issues have greatly improved. You can pair it with your phone to get a good real-time read of whether you're using the toothbrush correctly. After a few sessions, you'll get the feel of it. Easy to recharge. Charge lasts for several weeks of twice daily cleaning. Works in the short. Good quality. Feels a little strange at first in certain parts of your mouth; becomes "brushing as usual" after a few weeks. Really saw improvement in dental check-up. It's worth the $$s

Everything folks say here is true. This is the most expensive brush Sonicare makes. But unfortunately it's also the worst brush they've ever made. What make this brush seem like an upgrade at first glance, is the petite and efficient profile. Smaller case, and the haptic feedback buttons. In reality: - My brush handle broke in less than 2 years. The metal rod just became loose and the brush started to generate an awful sound - The haptic buttons are extremely easy to accidentally activate as you hold the brush normally - The haptic buttons are hard to press when you actually mean to press them. They're hard to find because their labels need to illuminate before you know where and what to press - The battery life seems shorter than the previous version - And here's the kicker, the brush just randomly turns off as you're brushing. Sometimes after 5 seconds, sometimes after 20 seconds, sometimes it works ok. I'm not the only one. You'll see tons of other reviewers experiencing the same problem. This issue happens even though the brush has the latest firmware, and is fully charged. Sonicare tried to make a brush that was their most efficient, visually most refined/simple brush they had ever made. In reality, they managed to over-engineer and over-design this thing to the point of hurting durability, functionality, affordability, and reliability. How is it not infuriating to pay so much for a brush and see it turn off at random times? Am I holding it wrong? This was experienced on two separate tooth brushes. 5 stars for the aspiration, 0 stars for the execution.

Probably the gold standard in toothbrushes. It does exactly what it says it's supposed to do, and it's easy to use. Comes with a fancy hard case like you've just bought a new pair of Ray Bans. It does auto power off after 2 or 3 minutes and I actually tend to use it for two or three cycles. I'm not sure if the timer is a setting that can be changed in the app maybe since I tend to brush my teeth a little longer. But this toothbrush works really well for what I need. It can reach pretty much anywhere in my mouth no struggle or fight. I can reach really hard areas with it and even if it takes a few passes I just brush a little longer if I need to clear some more stuck areas. One of the best investments I've made in a while.

I switched to the Philips Sonicare 9900 Prestige after experiencing recurring battery issues with my previous Oral-B iO9. Unfortunately, the battery would unexpectedly drop from around 60% to zero, and after three replacement units with the same problem, I decided it was time to try a different premium option in this category. I've been using the 9900 Prestige for about two weeks now and I'm really impressed. The brushing experience feels smoother and more gentle compared to what I was used to, while still delivering excellent cleaning results. The build quality is noticeably solid - it feels premium in hand and very well-made. I connected the app right from the start, and while the toothbrush works perfectly fine without it, I found the tutorials and tips genuinely helpful. They actually improved my brushing technique and made the experience more comfortable overall. A couple of things I really appreciate: the design prevents toothpaste from dripping down into the handle area, which keeps things cleaner, and the brush itself feels durable and built to last. It took me a day or two to adjust to the different brushing power, but once you get used to it, it's really quite good. The only minor downside is that you need the app to switch brushing modes or check the exact battery percentage. But considering my previous battery reliability issues, I'm just happy to have a brush that works consistently. Overall, I'm very satisfied with this purchase and would recommend it to anyone looking for a high-quality electric toothbrush.

I am a long time Sonicare user. My last 9500 died after about four years. The metal stem that holds the brush just popped out one day. The battery was fairly deteriorated so it was time soon anyway. When I started to explore my latest options from them, I was a little surprised by how little has changed. The models are all basically the same as they were back then. Except for this super fancy one. I was nervous about some of the reviews but I based my decision to buy on all of the good luck I have had with their toothbrushes prior. This is my third. It is early so I cannot speak to long term quality concerns that other have voiced. However, charging, usage, and app connectivity are all spot on. The app is a bit finicky and I wouldn’t buy it for that. My 9500 used the app as well and I really never used it beyond the first few days. I am going to try it again with this as it is improved but it still doesn’t do a great job of tracking much. The win here is with the powerful quiet motor housed in this slightly smaller soft touch handle. It looks and feels great. I also love that the case has USBC charging so you can charge up when traveling. Though with about a two week charge, you would need to be going a long time to need it. Most of my complaints are little things but at this price, Sonicare should be trying to get them right. For instance, why is there no midnight brush heads. You spend almost $400 for a toothbrush and nothing matches. The great tech designers would never have allowed that. Imagine Apple making a phone where the front didn’t match the back. Little but something they need to consider. You can’t store your brush heads in the carry case with the plastic head cover. Not huge but annoying. I do wish the app had more robust brushing tracking like their primary competitor. I also worry about quality based on some of these reviews though I will note that upon registering the brush, Sonicare has extended their warranty out to eighteen months which should give folks some additional peace of mind. If you aren’t sure, save the money and buy a 9500. For me, at least on sale, I am a fan.

Works Great. The new style brushes really do clean teeth well. Bit expensive but worth it.

At first, the Philips Sonicare 9900 was the best toothbrush I had ever used. It lived up to all of the 5 star reviews that I read before purchasing. After about 4 months, the vibration of the unit started to feel weaker and weaker. At the same time I was notified that I needed to replace the brush head, so I assumed that the weakness was due to that. I ordered 2 packs of replacement heads and swapped out the old one as soon as they arrived. The vibration did not improve at all, and after a week of using the new head my Sonicare 9900 has completely died. It does not turn on at all now (The battery is full). This has become the most expensive paperweight that I own (along with the brand new replacement heads that I cannot use). If you are in the market for a new electric toothbrush, rather opt for the cheap no-name brand that is now being advertised by your favourite YouTuber. That way when/if it dies, you won't feel like you were ripped-off like Philips has made me feel.