What Is an Interdental Brush? How Is It Used?
Written by
Gülay Akay
Published on
16.06.2025
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What Is an Interdental Brush?

When it comes to oral and dental health, many devices can come to mind. One such device, the interdental brush, is of interest to many people today. So, what is an interdental toothbrush? How is it used? If you are looking for answers to these questions, you are in the right place!

In this content we have prepared for you, we will address exactly what purpose an interdental brush serves, why it should be preferred, and how it is used. Immediately afterward, we will answer questions such as what to pay attention to when choosing a brush and which type of this brush is suitable for you. If you are ready, you can start reading our content!

What Is an Interdental Brush?

An interdental brush is a tool with a flexible wire structure equipped with bristle heads. While normal toothbrushes cannot enter the spaces between teeth, these interdental brushes can easily clean those gaps. In general shape, they are round; however, depending on the model, they can also be produced in oval shapes. The bristles are fixed onto a thin wire. There are designs in different sizes for front and back teeth.

What Is an Interdental Brush Used For?

Teeth are arranged adjacent to each other. Factors such as tooth structure, tooth shape, cavities, or diseases in the gums can, over time, create gaps between teeth. No matter how much you brush, these gaps tend to collect food debris. The remaining particles accumulate over time and lead to the problem known as tartar. Tartar forms dental plaque from accumulated food particles. In such cases where ordinary toothbrushes are insufficient, the use of an interdental brush is recommended.

If we look more closely at the purposes of using an interdental brush, we can mention the following points:

  • Cleaning food debris between teeth when a regular toothbrush is inadequate,
  • Preventing gap formation in patients experiencing gum recession,
  • Cleaning the junctions around implants,
  • Cleaning around bridges and dentures.

It is extremely important to use the interdental brush appropriately for its intended purpose. If you encounter bleeding or difficulty during use, rinse your mouth thoroughly with water and stop using it.

How Is an Interdental Brush Used?

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Using interdental brushes is quite simple, just like regular toothbrushes. The most important point to pay attention to is to brush your teeth thoroughly before using the interdental brush. You can follow these steps in order to use the interdental brush:

  • Place the brush at an appropriate angle into the space between your teeth.
  • Move the inserted brush back and forth about 10 times.
  • Prefer gentle movements rather than hard or forceful ones.
  • After using the brush, rinse your mouth thoroughly with plenty of water and clean the brush under running water.

The points mentioned are suitable for general use. However, do not apply toothpaste on the interdental brush before use. Additionally, some dentists recommend rinsing your mouth with an antiseptic before using the interdental brush. If your dentist has advised you to use an antiseptic, be sure to rinse before using the brush.

Why Should You Prefer an Interdental Brush?

Compared to regular toothbrushes, the interdental brush is more flexible. By cleaning the gaps between your teeth, you can prevent diseases that may develop in the oral cavity. We can additionally answer the question “Why should you prefer this brush?” with the following:

  • Prevents bacterial growth and tartar formation.
  • Provides complete and comprehensive oral care.
  • Although it serves the same function as dental floss, it can be more effective than floss.
  • Enters areas that a regular toothbrush cannot reach, preventing gum disease and tooth loss.
  • By preventing gap formation, it creates an attractive dental appearance.
  • Easy to learn and use.

Who Is an Interdental Brush Suitable For?

There are generally no restrictions on the use of an interdental brush. Both children and adults can use it comfortably. However, in some cases, dentists particularly recommend its use. We can list these situations as follows:

  • Those undergoing orthodontic (braces) treatment,
  • Those with gum recession,
  • Those who have had zirconia restorations,
  • Those who have difficulty using dental floss,
  • Those who have small or visibly large spaces between teeth.

If you suffer from any of the situations or discomforts listed above, we recommend that you make an appointment at our clinic as soon as possible for a comprehensive examination. You can learn from your dentist whether you can use an interdental brush and start using it as instructed.

Interdental Brush Sizes

Everyone’s mouth and tooth structure is different. Just as you choose a toothbrush suitable for your mouth and teeth, you should show the same attention to these brushes. Interdental brushes come in different sizes, diameters, and bristle thicknesses. A 0.4 mm interdental brush is identified as the thinnest, while a 1.55 mm brush is identified as the thickest. The sizes between these values are expressed as medium thickness.

Commonly used interdental brush sizes are as follows:

For Thin Spaces: 0.4 mm, 0.45 mm, 0.5 mm For Medium Spaces: 0.6 mm, 0.7 mm, 0.8 mm For Thick Spaces: 1.1 mm, 1.3 mm, 1.5 mm

Those who use interdental brushes without consulting a specialist dentist may encounter gum problems over time. Progressing gum diseases can lead to enamel damage and advanced tooth loss. Therefore, it is recommended that you definitely get advice from your dentist on which brush size to choose.

Frequently Asked Questions About Interdental Brushes

In this section of our content, we will answer questions frequently asked by those who use or wish to use interdental brushes.

What Does an Interdental Brush Do?

An interdental brush enters the gaps that regular toothbrushes cannot reach, helping prevent the accumulation of debris and plaque.

Can Anyone Use an Interdental Brush?

This type of brush can be used by anyone. However, in some individuals, the use of an interdental brush may be contraindicated. After completing the clinical examination, your specialist dentist will inform you whether you can use this brush. If your tooth structure is not suitable, using an interdental brush may cause spaces in that area.

Should the Tongue Be Brushed While Brushing Teeth?

Yes, it should be. Toothbrushes eliminate only about 85% of bacteria. The remaining bacteria can settle on the tongue and continue to produce sulfur compounds, which over time leads to bad breath. Regular tongue brushing can largely prevent odor formation.

How Should an Interdental Brush Be Chosen?

This question is one of the most frequently asked. When choosing an interdental brush, you should pay attention to your dentist’s recommendations and select the size your dentist deems appropriate.

Is an Interdental Brush Disposable?

These brushes are not single-use disposable products. You can use them multiple times during their usable life.

Should Toothpaste Be Applied to an Interdental Brush?

Dentists do not recommend applying toothpaste to interdental brushes.

How Often Should an Interdental Brush Be Replaced?

While toothbrushes are recommended to be replaced every few months, interdental brushes are generally recommended to be replaced within about 7 days. Depending on the model and product, this period may extend up to 15 days.

How to Select the Right Interdental Brush?

We mentioned at the beginning of our content that there are brushes in different forms. So, how can you choose the right brush? You can consider the following points to select the most suitable interdental brush for you:

  • Bristle Material: The bristles in these brushes are divided into synthetic and natural bristles. Synthetic bristles are more durable but may be harmful on sensitive surfaces. Natural bristles, on the other hand, are more flexible and much more suitable for sensitive surfaces.
  • Bristle Length: If you have narrow gaps between your teeth, you should prefer brushes with longer bristles. For general cleaning, you can choose brushes with shorter bristles.
  • Brush Size: The handle and head size of the brush you use should be appropriate for the area you want to clean.
  • Handle Design: Especially patients with neurological issues should prefer handles that are comfortable to hold.

If any of the above applies to you, we recommend that you make an appointment at our clinic and undergo a thorough examination as soon as possible. Your dentist can inform you whether you can use an interdental brush and instruct you on how to use it properly.

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