








Sonic Flex
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Premium Sonic Toothbrush with UV Sterilization and 25 Intensity Levels
The emmi Sonic Flex is the premium sonic toothbrush for anyone who doesn't want to leave their daily dental care to chance. With up to 38,400 mechanical movements per minute, 5 intelligent cleaning modes, and 25 finely tuned intensity levels, it adapts perfectly to your personal needs. It offers a UV sterilization travel case
and a battery life of up to 90 days - designed for people who value hygiene and control. It doesn't just scrub away. It cleans exactly the way that suits you.

Premium Sonic Toothbrush with UV Sterilization and 25 Intensity Levels
The emmi Sonic Flex is the premium sonic toothbrush for anyone who doesn't want to leave their daily dental care to chance. With up to 38,400 mechanical movements per minute, 5 intelligent cleaning modes, and 25 finely tuned intensity levels, it adapts perfectly to your personal needs. It offers a UV sterilization travel case
and a battery life of up to 90 days - designed for people who value hygiene and control. It doesn't just scrub away. It cleans exactly the way that suits you.
25 Intensity Levels & 5 Modes
Finally Find Your Perfect Setting
Most sonic toothbrushes give you three modes. Maybe five. But the jumps between levels are so large that you either brush too gently or your gums suffer. The Sonic Flex offers maximum adaptability: it combines 5 cleaning modes, each with 5 intensities. This results in 25 levels you can choose from.
Clean — for daily, thorough cleaning
Massage — gently stimulates gums
White — removes surface stains
Gum Care — especially gentle for sensitive gums
Sensitive — ideal for sensitive teeth

25 Intensity Levels & 5 Modes
Finally Find Your Perfect Setting
Most sonic toothbrushes give you three modes. Maybe five. But the jumps between levels are so large that you either brush too gently or your gums suffer. The Sonic Flex offers maximum adaptability: it combines 5 cleaning modes, each with 5 intensities. This results in 25 levels you can choose from.
Clean — for daily, thorough cleaning
Massage — gently stimulates gums
White — removes surface stains
Gum Care — especially gentle for sensitive gums
Sensitive — ideal for sensitive teeth


Constant Power
Even with low battery
As battery voltage decreases, cleaning performance usually also decreases. With many models in the mid-price segment, you lose up to 30 percent oscillation angle when the battery drops below 50 percent. The emmi Sonic Flex works with a constant voltage motor that delivers consistently strong performance – regardless of the battery's charge level.
In contrast to many conventional sonic toothbrushes, the cleaning motion remains stable and effective, even when the battery voltage drops.
The result: reliable cleaning performance with every use. No matter whether the battery is at 100 or 10 percent.

Constant Power
Even with low battery
As battery voltage decreases, cleaning performance usually also decreases. With many models in the mid-price segment, you lose up to 30 percent oscillation angle when the battery drops below 50 percent. The emmi Sonic Flex works with a constant voltage motor that delivers consistently strong performance – regardless of the battery's charge level.
In contrast to many conventional sonic toothbrushes, the cleaning motion remains stable and effective, even when the battery voltage drops.
The result: reliable cleaning performance with every use. No matter whether the battery is at 100 or 10 percent.
UV Sterilisation in the Travel Case
No More Bacteria on Your Brush
Those who travel a lot know the problem: After brushing, the wet brush goes into a fabric sleeve or plastic cap, and there, bacteria multiply many times over within a few hours.
The included UV-Travel-Case of the Sonic Flex solves the problem. A UVC LED eliminates up to 99.9 percent of bacteria on the brush head.
Ideal for travel, business trips, or hygienic everyday use:
- Charging in the travel case
- UVC-LED sterilization
- Eliminates 99.9% of bacteria on the brush head
- Automatic safety shutdown when the lid is open.
- Automatic shutdown after 10 minutes when the lid is closed.
This way, your toothbrush stays hygienically clean and ready for use at all times, even when you're on the go.

UV Sterilisation in the Travel Case
No More Bacteria on Your Brush
Those who travel a lot know the problem: After brushing, the wet brush goes into a fabric sleeve or plastic cap, and there, bacteria multiply many times over within a few hours.
The included UV-Travel-Case of the Sonic Flex solves the problem. A UVC LED eliminates up to 99.9 percent of bacteria on the brush head.
Ideal for travel, business trips, or hygienic everyday use:
- Charging in the travel case
- UVC-LED sterilization
- Eliminates 99.9% of bacteria on the brush head
- Automatic safety shutdown when the lid is open.
- Automatic shutdown after 10 minutes when the lid is closed.
This way, your toothbrush stays hygienically clean and ready for use at all times, even when you're on the go.


Up to 90 days battery life
No more searching for a charger when traveling
The emmi Sonic Flex's battery lasts up to 90 days when brushing twice a day. A long vacation trip? No problem. The Sonic Flex will last. Those who only have to think about the charging cable once a quarter will appreciate maximum freedom and comfort.

Up to 90 days battery life
No more searching for a charger when traveling
The emmi Sonic Flex's battery lasts up to 90 days when brushing twice a day. A long vacation trip? No problem. The Sonic Flex will last. Those who only have to think about the charging cable once a quarter will appreciate maximum freedom and comfort.
PEDEX High-Performance Bristles
152% more cleaning power
The brush heads of the emmi Sonic Flex are equipped with PEDEX Magic-Twist bristles from Germany.
In a laboratory study conducted in cooperation with the University of Witten/Herdecke, these achieved a cleaning performance of up to 152% compared to conventional nylon bristles, which are often used in competitor models.

PEDEX High-Performance Bristles
152% more cleaning power
The brush heads of the emmi Sonic Flex are equipped with PEDEX Magic-Twist bristles from Germany.
In a laboratory study conducted in cooperation with the University of Witten/Herdecke, these achieved a cleaning performance of up to 152% compared to conventional nylon bristles, which are often used in competitor models.


Smart Color-Change Bristles
Integrated color-change bristles ensure continuously optimal results: After about three months, the color visibly fades, reliably indicating when a brush head change is necessary – completely automatically, without an app, without a sensor, and without additional reminders.
This way, effective cleaning and maximum hygiene are combined in one well-thought-out system.

Smart Color-Change Bristles
Integrated color-change bristles ensure continuously optimal results: After about three months, the color visibly fades, reliably indicating when a brush head change is necessary – completely automatically, without an app, without a sensor, and without additional reminders.
This way, effective cleaning and maximum hygiene are combined in one well-thought-out system.
Why emmi Sonic Flex?
Key facts at a glance
- Vibration frequency: 29,760–38,400 movements/minute
- 5 modes × 5 intensities = 25 settings
- UV travel case with UVC-LED (285 nm, 10-minute automatic)
- Bristles: PEDEX Magic-Twist + color-changing bristles
- Constant power output regardless of battery level
- Battery life: up to 90 days
- Battery: 2200 mAh lithium-ion
- Charging: inductive, wireless via the UV travel case or USB-C

Why emmi Sonic Flex?
Key facts at a glance
- Vibration frequency: 29,760–38,400 movements/minute
- 5 modes × 5 intensities = 25 settings
- UV travel case with UVC-LED (285 nm, 10-minute automatic)
- Bristles: PEDEX Magic-Twist + color-changing bristles
- Constant power output regardless of battery level
- Battery life: up to 90 days
- Battery: 2200 mAh lithium-ion
- Charging: inductive, wireless via the UV travel case or USB-C

Who is the emmi Sonic Flex the right choice for?
The Sonic Flex is made for people who have classic premium demands: thorough cleaning, German bristles, UV hygiene, long battery life, no app, no gimmicks. It is the right choice if you have sensitive gums and are finally looking for a brush that adapts to you instead of the other way around. It is the right choice if you travel a lot and don't want to look for an outlet in the hotel bathroom. And it is the right choice if you are looking for a brand that has been at home in oral hygiene for over 25 years — with a service team in Germany that answers in German when you have a question.
Try it now for 30 days

Try it now for 30 days

Note:
This model, emmi Sonic Flex, is a sonic toothbrush and cleans through mechanical movement and vibration. Are you looking for cleaning completely without mechanical movement—ideal for sensitive teeth or gums, implants, braces, or periodontitis? Then our patented emmi-dent ultrasonic toothbrushes are the ideal solution for you. We offer both technologies. Your needs will determine which one suits you.

Effectiveness of ultrasound proven by studies
The functionality of our emmi-dent ultrasonic toothbrushes was tested as part of a clinical study by the University of Witten/Herdecke . Prof. Dr.hcP Gängler, Managing Director of the Oral Medicine Institute, assessed the test of our emmi-dent ultrasonic toothbrushes with the following words: "Cleaning teeth using ultrasound and without brushing safely and thoroughly removes plaque and biofilm. Brushing damage to tooth necks, gums and teeth can be prevented thanks to this technology. Toothbrush that is particularly suitable for people with sensitive teeth. The abrasion-free application ensures that gum injuries can be actively avoided. In addition, regular use actively promotes the reduction of gingivitis."

Effectiveness of ultrasound proven by studies
The functionality of our emmi-dent ultrasonic toothbrushes was tested as part of a clinical study by the University of Witten/Herdecke . Prof. Dr.hcP Gängler, Managing Director of the Oral Medicine Institute, assessed the test of our emmi-dent ultrasonic toothbrushes with the following words: "Cleaning teeth using ultrasound and without brushing safely and thoroughly removes plaque and biofilm. Brushing damage to tooth necks, gums and teeth can be prevented thanks to this technology. Toothbrush that is particularly suitable for people with sensitive teeth. The abrasion-free application ensures that gum injuries can be actively avoided. In addition, regular use actively promotes the reduction of gingivitis."
Since I started using Emmi, I have had much less tartar and my teeth feel smooth and clean. I can recommend it at any time.
After using it for two weeks, I noticed that my teeth were much less sensitive to pain. They were also a little whiter; one tooth that had taken on a yellowish color is now nice and white again. I am delighted. It takes some getting used to, but I got the hang of it relatively quickly. I can highly recommend this toothbrush.
Really clean, smooth, shiny teeth. All without any effort. Simply great. I can recommend it to everyone!
What our customers say
FAQ
The most frequently asked questions at a glance
How long does the battery of the emmi Sonic Flex last?
How long does the battery of the emmi Sonic Flex last?
When used twice daily for two minutes each time, the 2200 mAh lithium battery lasts up to 90 days. The actual runtime depends on the selected intensity level — at the highest level, the runtime is reduced to about 60 days. Thanks to the constant voltage motor, the cleaning performance remains consistently strong until the next charge.
How does UV sterilization work in the travel case?
How does UV sterilization work in the travel case?
The included travel case contains a UVC LED with a wavelength of 285 nanometers. As soon as you close the lid, the UV light automatically activates for ten minutes and eliminates up to 99.9 percent of bacteria on the brush head. If you open the lid, the light immediately switches off – thus preventing skin contact with UV radiation.
Can I charge the emmi Sonic Flex wirelessly?
Can I charge the emmi Sonic Flex wirelessly?
Yes. The Sonic Flex supports two charging methods: inductive wireless charging via the included travel case or direct USB-C charging. A full charge takes about 8 hours.
How often do I need to change the brush head?
How often do I need to change the brush head?
Sonic Flex brush heads feature color-changing bristles that fade after approximately three months, signaling that a replacement is needed. With daily use, we recommend changing them every three months—regardless of how good the bristles still look.
How does the emmi-dent ultrasonic toothbrush work?
How does the emmi-dent ultrasonic toothbrush work?
Compared to electric sonic toothbrushes, emmi-dent ultrasonic toothbrushes clean without mechanical movements. The patented piezo-ceramic disc (ultrasound transducer) is located in the brush head of the emmi-dent ultrasonic toothbrush. In the smart brush head, electrical energy is converted into ultrasonic waves, which are transferred to the teeth and gums via the bristles, with the help of special ultrasonic toothpastes and saliva. The ultrasound transducer is made to vibrate (up to 96 million multi-frequency oscillations). These ultrasonic waves destroy the structure of the micro-bubbles enriched in the toothpaste, they collapse and create a suction effect. This suction effect removes biofilm and plaque. The standard process of brushing teeth.
The ultrasound is neither audible nor noticeable. Nevertheless, in conjunction with a special ultrasonic toothpaste, it generates millions of tiny micro-bubbles. Thanks to their small size, these penetrate even the smallest interdental spaces, where they collapse and create a suction effect. This dissolves impurities such as biofilm and plaque. The vibrations of the ultrasonic toothbrush transport the dissolved dirt from the interdental spaces. You then simply rinse it out. The result is healthy, sustainably cleaned and smooth teeth.
Who is the emmi-dent ultrasonic toothbrush suitable for?
Who is the emmi-dent ultrasonic toothbrush suitable for?
Our emmi-dent ultrasonic toothbrushes are basically suitable for all people who want to clean their teeth gently and, above all, exclude the risk of "scrubbing away" the tooth enamel. Particularly suitable for people with sensitive gums, gingivitis and periodontitis, braces wearers, implants and bridges. We offer ultrasonic toothbrushes for all ages. Our range includes various brush heads, including an attachment for children and people with small mouths. This makes dental care child's play for the youngest.
Older people and people with motor challenges also benefit from the simple operation of the ultrasonic toothbrush. The emmi-dent Platinum Care is recommended for this. Awarded the EURECERT certificate! The world's first barrier-free certified toothbrush.
The ultrasonic toothbrush also helps with bad breath by reducing bacteria to a healthy level.
We have developed a special brush head for people who wear braces. The ultrasonic vibrations thoroughly clean even the inaccessible areas between teeth and braces. People with dental implants also benefit from the maximum cleaning performance of the innovative ultrasonic technology.
What is the difference between ultrasonic toothbrushes and normal electric toothbrushes?
What is the difference between ultrasonic toothbrushes and normal electric toothbrushes?
Electric toothbrushes include rotary toothbrushes, sonic toothbrushes and ultrasonic toothbrushes. While the former usually have round brushes that rotate alternately from left to right, sonic toothbrushes are equipped with elongated, vibrating heads. With 20,000 to 40,000 vibrations per minute, they achieve significantly higher mechanical movements than rotary brushes. Ultrasonic toothbrushes surpass this performance many times over and are
also a completely different technology. While rotary and sonic toothbrushes remove the biofilm with the help of mechanical movements, the emmi-dent works with up to 96 million ultrasonic vibrations per minute and does not require any mechanical movements for tooth cleaning. Motionless tooth cleaning thanks to the latest ultrasonic technology.
The decisive difference lies in the type of tooth cleaning:
Like manual toothbrushes, rotary and sonic toothbrushes also clean the teeth mechanically. This so-called macro cleaning can cause
The toothbrush poses a risk of injuries to the gums and tooth enamel. In addition, ultrasound can minimize inflammation. This is confirmed by our study.
Dental care is limited to the areas of the mouth that the rotary or sonic toothbrush can reach. Unlike conventional electric toothbrushes, the ultrasonic toothbrush works without any pressure by transmitting vibrations. This means that the entire oral cavity is thoroughly cleaned.
emmi Sonic Slim - Premium Sonic Toothbrush with UV Sterilization and 25 Intensity Levels
The emmi Sonic Flex is the premium sonic toothbrush for those who want to leave nothing to chance with their daily dental care. 25 finely graded intensities, a UV sterilization travel case, and a battery life of up to 90 days - developed for people who value hygiene, control, and German engineering. It doesn't just scrub away. It cleans exactly the way that suits you.
25 intensity levels instead of 3 modes - finally find your perfect setting
Most sonic toothbrushes offer you three modes. Maybe five. But the jumps between settings are so great that you either brush too gently or your gums suffer. The Sonic Flex does it differently: it combines 5 cleaning modes, each with 5 intensities. That makes 25 levels from which you can truly choose. Clean — for daily, thorough cleaning. Massage — gently stimulates gums. White — removes surface stains. Gum Care — especially gentle for sensitive gums. Sensitive — ideal for sensitive tooth necks or after a visit to the dentist. Each mode can be finely adjusted across five intensities. If you want to brush more vigorously in the morning than in the evening, you'll find the right setting for both. If you want to gradually increase pressure two weeks after a dental visit, you can do so step by step.
Constant Voltage Motor — Day 1 feels like Day 90
A detail that nobody writes on the packaging, but which everyone who has owned their sonic toothbrush for more than three months will notice: as the battery voltage drops, so does the cleaning performance. With many models in the mid-price segment, you lose up to 30 percent of the oscillation angle when the battery drops below 50 percent - without anyone mentioning it. The Sonic Flex uses a magnetic levitation motor with constant voltage regulation. This means: The 29,760 to 38,400 oscillations per minute remain equally strong - regardless of whether the battery is at 100 or 10 percent. You will clean just as effectively on the 90th day as on the first.
UV sterilization in a travel case — no more bacteria-ridden travel toothbrushes
Anyone who travels a lot knows the problem: after cleaning, a wet brush is placed in a fabric pouch or a simple plastic cap, and there, bacteria multiply many times over within a few hours. The UV-Travel-Case supplied with the Sonic Flex solves the problem. A UVC LED
with a wavelength of 285 nanometers eliminates up to 99.9 percent of bacteria on the brush head. Close the lid, turn on the light, automatic shutdown ten minutes later. The case also serves as a charging station. Charge the case via USB-C, and the brush charges inductively inside the case. One cable for everything. And if you open the case during sterilization, the UV light automatically switches off – preventing skin contact.
Who is the emmi Sonic Flex the right choice for?
The Sonic Flex is made for people who appreciate classic premium quality: thorough cleaning, German bristles, UV hygiene, long battery life, no app, no gimmicks. It's the right choice if you have sensitive gums and are finally looking for a brush that adapts to you instead of the other way around. It's the right choice if you travel a lot and don't want to search for a power outlet in your hotel bathroom. And it's the right choice if you're looking for a brand that has been at home in oral hygiene for over 25 years — with a service team in Germany that answers in German if you have a question.
Ultrasonic toothbrush comparison
Dentists recommend the use of ultrasonic toothbrushes like the emmi-dent ultrasonic toothbrush, as they allow for effective plaque removal while being gentle on teeth and gums. The gentle cleaning method is ideal for preventing gingivitis and periodontitis, as well as for the care of implants and dental crowns.
The emmi-dent electric ultrasonic toothbrush is suitable for both adults and children and can be conveniently purchased online. In contrast to manual toothbrushes, ultrasonic toothbrushes offer superior cleaning performance, which is highlighted in various test winner reviews.
















