Beatrice Lang
Electric toothbrushes are classified into power, sonic, or ultrasonic toothbrushes, depending on their speed. While power toothbrushes have standard speeds, sonic toothbrushes vibrate at 200 to 400 Hz, or 12,000 to 24,000 oscillations per minute, and ultrasonic toothbrushes vibrate at frequencies higher than 20,000 Hz. The Spinbrush Original Toothbrush, for example, spins 4,500 times per minute. Electric toothbrushes with spinning heads are also safer than manual toothbrushes and are safe for both hard and soft oral tissues.
| Characteristics | Values |
|---|---|
| Speed of movement | 20–20,000 Hz or 2400–2,400,000 movements per minute |
| Sonic toothbrushes | 200–400 Hz or 12,000–24,000 oscillations or 24,000–48,000 movements per minute |
| Spinbrush™ Original Toothbrush | 4,500 sweeps per minute |
| Ultrasonic toothbrushes | Faster than 20,000 Hz |
| Ultrasonic toothbrushes | 100–1000 times faster than conventional rotating or sonic toothbrushes |
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What You'll Learn
- Electric toothbrushes can be classified as standard power, sonic, or ultrasonic
- Ultrasonic toothbrushes have no electric motor and use a piezoelectric crystal
- Sonic toothbrushes vibrate at about 260Hz, translating to 31,000 brush strokes per minute
- Electric toothbrushes were initially created for patients with limited motor skills
- Electric toothbrushes can clean teeth more effectively than manual toothbrushes
Electric toothbrushes can be classified as standard power, sonic, or ultrasonic
Electric toothbrushes are a great way to improve your oral health. They can remove more plaque and reduce gingivitis more effectively than manual toothbrushes. Electric toothbrushes can be classified as standard power, sonic, or ultrasonic, depending on their speed and the technology they use to clean your teeth.
Standard power electric toothbrushes are the most common type and typically have a rotating mechanism that moves back and forth at high speed, scrubbing away plaque. They usually have frequencies ranging from 200 to 400 Hz, which is within the audible range of the human ear (20 Hz to 20,000 Hz). This means they produce a humming sound when in use.
Sonic toothbrushes are a more advanced type of electric toothbrush that operates at a higher frequency than standard power brushes. They produce a vibration in the audible range, typically between 200 to 400 Hz, or 12,000 to 48,000 oscillations per minute. This high-speed vibration creates a "humming" sound, and the length of the sweeping movements is large, making them a little tricky to use at first. Sonic toothbrushes rely solely on this sweeping motion to clean the teeth, and one study found that they cause less abrasion to the gums compared to manual toothbrushes.
Ultrasonic toothbrushes are the newest type of electric toothbrush and they differ from sonic toothbrushes in their cleaning mechanism. Ultrasonic toothbrushes use very high-frequency vibrations, referred to as ultrasound, to clean the teeth and remove plaque and bacteria. These toothbrushes operate at a frequency of at least 20,000 Hz or 2.4 million movements per minute, which is above the audible range of human hearing. Within the USA, the Food and Drug Administration (FDA) specifies a minimum of 1.92 million movements per minute for ultrasonic toothbrushes. These high-frequency waves can break up bacterial chains and work up to 5mm below the gum line. Some ultrasonic toothbrushes also provide additional sonic vibration, which creates a sound that helps users overcome the strange sensation of not having to brush their teeth in the traditional way.
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Ultrasonic toothbrushes have no electric motor and use a piezoelectric crystal
Electric toothbrushes vibrate rather than spin, as this allows the bristles to cover more surface area and clean more effectively. A spinning toothbrush would risk damaging the teeth and gums, as well as being less reliable and more prone to jamming.
Ultrasonic toothbrushes are a type of electric toothbrush that uses ultrasound-induced vibrations to clean the teeth. Ultrasonic toothbrushes do not have electric motors and instead use a piezoelectric crystal to generate ultrasonic waves.
The piezoelectric crystal is placed in the head of the toothbrush and emits ultrasonic waves between the bristles. These waves couple with the user's teeth via the dentifrice (toothpaste) in their mouth. The ultrasonic waves cause mild cavitation within the dentifrice, which loosens and removes soft plaque from the teeth.
The piezoelectric crystal works through the inverse piezoelectric effect, where the crystal resonates and mechanically deforms in response to an applied pulsed electrical field. This conversion from electrical to mechanical energy results in the propagation of ultrasonic waves that drive the movement of the bristle tips.
Ultrasonic toothbrushes are designed to be safe for daily use and reduce the risk of oral damage compared to other ultrasonic cleaning methods. They are also effective at removing plaque and reducing gingival inflammation, making them a promising tool for maintaining good oral health.
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Sonic toothbrushes vibrate at about 260Hz, translating to 31,000 brush strokes per minute
Electric toothbrushes can be classified into three types based on their movement speed: standard power toothbrushes, sonic toothbrushes, and ultrasonic toothbrushes. Sonic toothbrushes are a subset of electric toothbrushes that vibrate at a frequency that falls within the audible range of 20 Hz to 20,000 Hz. These toothbrushes vibrate at about 260 Hz, which translates to 31,000 brush strokes per minute, or 10 times faster than ordinary electric toothbrushes.
The high-speed rotary motion of the electric motor in a sonic toothbrush is converted into a reciprocating (back-and-forth) brushing motion by the crank and gear unit, which cleans teeth more effectively. This mechanism allows the brush head to move together at the right speed and force, preventing damage to the teeth while ensuring a thorough clean.
In comparison to rotating toothbrushes, sonic toothbrushes provide a more comprehensive clean due to their sweeping motion. Rotating brushes may only adequately clean one side of each tooth, and the bristles are more likely to bend in one direction. Additionally, rotating brushes can be unsafe, especially if they get entangled in long hair, which could cause injury and damage the mechanism.
Ultrasonic toothbrushes, on the other hand, operate at an even higher frequency, vibrating about 100–1000 times faster than sonic toothbrushes. Unlike sonic toothbrushes, ultrasonic toothbrushes do not contain an electric motor. Instead, they utilize a piezoelectric crystal to generate ultrasonic motions, creating a cavitational cleaning effect.
Overall, the speed and frequency of sonic toothbrushes, vibrating at 260Hz and delivering 31,000 brush strokes per minute, contribute to their effectiveness in oral care, making them a popular choice among electric toothbrush options.
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Electric toothbrushes were initially created for patients with limited motor skills
Electric toothbrushes have come a long way since their inception in the 1930s. The earliest example of an electric toothbrush was produced by Tomlinson Moseley and sold as the Motodent in 1937. However, these early iterations were clunky and sometimes problematic. The electric toothbrush as we know it today was first invented in 1954 by Dr. Philippe Guy Woog in Switzerland. Known as the Broxodent, it was initially created for patients with limited motor skills and those with orthodontic appliances like braces.
The Broxo Electric Toothbrush was introduced in the United States in 1960 by E. R. Squibb and Sons Pharmaceuticals and marketed under the names Broxo-Dent or Broxodent. This toothbrush plugged into a standard wall outlet and ran on line voltage. In the 1980s, Squibb transferred the distribution of the Broxodent line to the Somerset Labs division of Bristol-Myers Squibb.
The introduction of the Broxo Electric Toothbrush marked a significant step forward in oral hygiene, particularly for individuals with limited motor skills. These toothbrushes made it easier for people with physical challenges to maintain proper dental care, reducing the risk of dental conditions and overall health issues associated with poor oral health.
Over time, electric toothbrushes evolved to become more portable and user-friendly. In the early 1960s, General Electric introduced a cordless rechargeable toothbrush, although it was rather bulky in size. The use of rechargeable batteries was a notable improvement, allowing users to operate the toothbrush without being restricted by a power outlet.
Today, electric toothbrushes offer a range of features that enhance their effectiveness and convenience. They are designed to cover larger areas of teeth in a shorter time, reducing the number of bacteria that cause periodontal and gum diseases. They also help users brush for the full two minutes recommended by dentists, improving overall oral hygiene. Additionally, some models have built-in water flossers, sync with smartphone apps to provide brushing data, and are even constructed from biodegradable materials, making them environmentally friendly.
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Electric toothbrushes can clean teeth more effectively than manual toothbrushes
Electric toothbrushes are generally considered more effective at removing plaque and keeping teeth clean than manual toothbrushes. They can produce thousands of strokes per minute, which helps to prevent cavities and gum disease. The vibration of electric toothbrushes allows for more micro-movements every time you move your toothbrush across your teeth. This rapid vibration or oscillation of electric toothbrushes helps to remove plaque buildup from your teeth and gums, reducing plaque by 21% and gingivitis by 11% after three months of use.
The American Dental Association (ADA) states that both electric and manual toothbrushes are effective at removing oral plaque that causes decay and disease. However, various studies have shown that powered toothbrushes remove more plaque and do more to reduce gingivitis than manual toothbrushes. Electric toothbrushes can also help improve brushing habits, as they encourage users to brush for the dentist-recommended duration of two minutes. They can also help users avoid brushing too hard, which can damage gums and teeth.
One disadvantage of electric toothbrushes is their cost. They are more expensive than manual toothbrushes and require new brush heads every three months, adding to the overall cost of ownership. Electric toothbrushes also require electricity to operate, which may be inconvenient when travelling.
Ultimately, dental experts point out that the choice between an electric and manual toothbrush depends on personal preferences and factors such as age and general health. Both types of toothbrushes can effectively clean teeth if used properly and for the recommended duration. However, electric toothbrushes may be particularly beneficial for individuals with orthodontic appliances such as braces, as they can make brushing easier and more effective.
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Frequently asked questions
Electric toothbrushes don't spin, they vibrate. This is because if a toothbrush only rotated in one direction, it is likely that only one side of each tooth would get cleaned. The bristles would also wear out more quickly.
Vibrating toothbrushes get more coverage in their cleaning. The bristles slide up one side of the curve of a tooth and then whip by the other side, so a toothbrush that only rotates in one direction is less effective.
Sonic toothbrushes vibrate at about 260Hz or 260 times per second, which translates to 31,000 brush strokes per minute. Ultrasonic toothbrushes vibrate about 100-1000 times faster than sonic toothbrushes, producing a genuine cavitational cleaning effect.
