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've tried many brands of electric toothbrush and this model works the best. I tend to push too hard on the brush when brushing. Most brushes will briefly stop and wait to continue brushing which is super irritating. This model has a stronger motor and powers through brushing with a slightly stronger push which is wonderful. My teeth are clean and my gums feel great. I have used the model below and above this one. The model above this one is their top tier model and only works with a phone app which is very irritating for a device you use every day. The model below this one doesn't have as strong a motor and pauses out frequently for me.

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.

TLDR; Its a bog standard electric toothbrush with nothing special about it at all. Save your money and get something more reliable. The long version; It's unreliable charging on the base it comes with. It has been since I got it. Maybe there's a secret dance you're supposed to do to get the charger to work reliably as you place the toothbrush on it's charger? If there is, I don't know it and I find charging this toothbrush one of the most frustrating, unsatisfactory usages of my time. I'm literally to the point where I have to stand in front of the charger that I've placed the toothbrush on, and just wait. Is it going to start beeping at me eventually? How long do I have to stand here before I'm confident there'll be no issue with the brush charging? Who knows?? I haven't figured that out 100% yet and I've hovered over this toothbrush for a full minute before it finally indicated it wasn't charging right. How do I know? I recorded it! I feel like a lunatic having to say this stuff so I needed the data to prove to myself - I'm not imagining it. I'm not exaggerating. I will happily share the footage with anyone who asks. I've been fussing with this toothbrush since April when I got it and it's now November. I told myself, "it's too expensive to just give up on! Surely it's just a matter of user error right??" Nah. This is a known issue by Philips. I searched for a solution thinking I must just be missing something. Their FAQ first frames it as user error, telling users not to charge with the wrong base. Philips charging bases aren't interchangeable. Really Philips? How is that cost effective or smart design in any fashion? Do better. But let's not get hung up on that. This base came with the brush at the time of purchase. Moving on. They tell you things like "make sure your charger is not on a metal surface." -_- Is there a lot of metal in the average persons bathroom? I ask because I feel like I'm being gaslit by Philips into thinking I'm just incompetent as a toothbrush or tech user somehow. I know a lot of metal exists in some bathrooms. But I haven't seen a lot of people using those metal filled bathrooms to charge their toothbrush in. Those bathrooms are usually in gyms, military ships, convenience stores, or public restrooms that get high traffic. It starts to feel insulting when I'm working so diligently to get this very expensive item to work, to do a necessary task, twice a day, to have the maker say things like this when it's obviously a known issue if you do a 5 second internet search. Heaven forbid you place it on the charger and you think it's charging so you walk away. Unbeknownst to you, there's a small faint beep that's started since you left. You go to pick it up to use it the next time you want to brush your teeth and you might notice it doesn't work. Guess what! Your toothbrush is dead as a doornail. It's not charged. I've taken to trying to brush my teeth additional times throughout my day, to try and avoid being caught out by a dead toothbrush, right before I go to bed or when I need to get out the door for work/life. How is that an efficient use of my time? But if I don't - I run the risk of not being able to properly care for my teeth and brush thoroughly twice a day. Does Philips know how stupid they make customers feel with their crappy product and apparent disinterest in making sure their tech has any sort of reliable quality standard. "I spent a lot of money on a well reviewed toothbrush that's supposed to be one of the best so I don't have to spend loads of extra money, time, pain or suffering over dental issues. Does it have charge yet? Can I use it yet? No? Dang." Sure, I can use it manually - but doesn't that defeat the point here??? I'm sick of companies not valuing customers time, money or shopping efforts to find and acquire products they need in their lives. I'm sick of companies producing the most minimal pieces of junk they can possibly spew out, slapping some proverbial lipstick on their frankenstein pig creation by making it pretty colors or shiny (seriously? a shiny charger? for a toothbrush? you've brushed your teeth before right Product Designers of Philips? I know you know toothbrushes drain. The stand you include has drainage. Why doesn't the charger? Why is the charger gold? Is that a good look to someone, with the way a toothbrush drains a sort of toothpaste tinted water?) Toothbrushes drain downwards onto chargers. Duh, right? I get that working chargers aren't really Philip's thing but it feels necessary to point this out because it seems like if you use your toothbrush and it indicates it needs charged, and you place it on the charger - Philips would understand, there's gonna be some water drainage. I find that if my toothbrush has any water in, on or around it - it freaks out and can't charge. I have to literally ~dry~ my toothbrush to try and charge it. I don't mean just wipe the base and sides of it with a microfiber cloth. I mean, make sure you flick every speck of water out of the head, then wipe down the sides and base, wipe down the charger, and take off the head. Wipe any water you might find that got under the head at the point where it connects, and then place it on the charger. Even then it's not guaranteed to work. Don't walk away, you're not done. You need to start a timer for yourself. At least 1 minute. You're gonna wanna wait to see if you missed even the tiniest bit of water that makes its way down to the charger so you can dry that too. You'll know because the charger will start making your toothbrush beep and flash like it's about to self-destruct. I don't remember any of this being included in it's advertising. I'm pretty sure if someone had told me the toothbrush I'm considering purchasing needs dried to the point of OCD - I'd have had 2nd thoughts about such a purchase. Especially for the price I paid. So no. I would not recommend this toothbrush. If someone knows of one that's better, hit me up. And if anyone from Philips actually takes the time to read this, you're welcome. Product ideas make bank. I've given you a lot here. A charger that drains. A charger that's not gold. A toothbrush that can handle being wet and still charge. A quality toothbrush that does what it's supposed to would ensure customer loyalty and lock them in to buying replacement heads for life. Get it together.

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

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

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.

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.

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.