Comparison Oral-B iO Series 3 vs Oral-B iO Series 4

The number of brush modes provided by the device. The presence of several modes allows using the device for different procedures (for example, daily cleaning, delicate cleaning, whitening, etc.). Each such program has its own features of the working nozzle, as well as its own timer settings. The downside of such multifunctionality is the increased cost. In any case, this feature significantly expands the capabilities of the device; however, the specific set of modes may be different - it would not hurt to clarify it separately.

In this case, the mode means the general format of operation. For more information on the different formats, see "Modes" below. Note that this parameter should not be confused with the number of power settings. The latter is specified separately - see "Power modes", and in general, these characteristics are practically independent of each other. For example, a brush with one mode of operation can have several power settings. And vice versa, there may be only one power level, but several formats of operation.

The ability to synchronize the device with a smartphone, tablet or other similar gadget. It is found mainly in toothbrushes, but can also be used in other types of devices (see "Type").

Synchronization with an external gadget, typically via Bluetooth, requires the installation of a dedicated application. The functionality of this app determines the available features when using the toothbrush with a smartphone or tablet. However, these functions extend well beyond what the toothbrush can do on its own, thanks to the smartphone or tablet's screen capabilities. Common features include displaying a timer countdown and the ability to customize the timer settings if the default values don't meet the user's preferences. The application also typically provides other relevant information, such as the selected brushing program and battery charge status. Some toothbrushes with this feature can even assess the overall effectiveness of each brushing session, process this data within the app (like tracking trends over time), and sometimes transmit this information over the internet, allowing for remote consultations with a dentist.

While in the past, the primary drawback of models offering smartphone synchronization was their high price, nowadays, even low-cost-friendly toothbrushes come with this feature. Additionally, some models go the extra mile by including dedicated smartphone holders for added convenience.

Additional items supplied with the device (in addition to the base and attachment set).

The most popular types of such items nowadays are charging stand, accessory stand, UV sanitizer and case ; Here is a more detailed description of each option:

— Charging stand. A battery charging device designed as a stand serves the dual purpose of recharging the battery and offering added convenience for storing the device. It's worth noting that this function can apply to dental centers, even if they primarily operate on mains power (as indicated in the "Type of power" section). In such cases, the toothbrush included with the dental center typically runs on batteries, and the charging stand is typically integrated directly into the main unit of the dental center for ease of use.

— Stand for accessories. A device designed to hold various accessories, primarily interchangeable nozzles, can come in different designs. For example, in toothbrushes and portable irrigators, this device is often integrated into a charging stand, which includes both a charging socket and open compartments for accessories. In irrigators and fixed-layout dental centers, these compartments are usually built into the main unit or the lid of the water tank. In this case, the compartments are typically covered with lids for hygiene reasons, making it...a more hygienic option. Regardless of the design, having a dedicated stand for accessories enhances the convenience of storing them.

— UV sanitizer. A device that uses ultraviolet (UV) radiation for disinfecting the device, particularly replaceable nozzles, is typically designed as a distinctive container. In some models, this container also serves as a cover or case. The disinfection process effectively eliminates the majority of pathogenic bacteria and viruses, all without the need for additional chemicals and ensuring safety as the radiation remains confined within the container. However, it's important to note that UV disinfection is not effective against regular dirt and debris, so having this function doesn't eliminate the need to clean the nozzle through washing.

— Case / cover. The device comes with a storage and carrying container, which can be either a hard case or a soft cover. Hard cases offer better protection, while soft covers are more compact and can be rolled up when not in use. Regardless, both of these accessories are highly convenient for storage and transportation. They safeguard the contents from dirt and damage, and in many cases, provide space to store additional accessories, reducing the risk of losing them. While you could use makeshift packaging for the same purpose, the provided container is typically more practical.

The time required to charge the battery from zero to 100% in a device with the appropriate power type (see above). This parameter can vary from 1 – 3 hours in relatively simple and low-power devices to a day in advanced models with capacious batteries. At the same time, the longer the maximum operating time on a charge (see above), the longer, usually, the time required for charging, although there is no hard dependence here.

In general, having fast charging capabilities improves the convenience of a device by reducing interruptions in its operation. However, there is a trade-off to consider: fast charging often means either a smaller battery capacity or a higher price due to the use of specialized technologies to speed up the charging process. When evaluating this parameter, it's essential to think about how you intend to use the device. For instance, if a toothbrush or irrigator is solely used at home by one person and comes with a charging stand, fast charging may not be a critical factor. The device remains consistently charged as it's constantly on the charger, and its battery doesn't deplete significantly during one use. The time between sessions, usually around 8 to 12 hours, is more than enough to maintain a charged battery, even for devices with slower charging. However, if you plan to use the device while traveling, where access to power outlets is sporadic, it's preferable to have minima...l charging time to ensure you can recharge quickly during your trips.