How to choose the right Autobrush head size
Finding the right brush head size is key to having the best brushing experience. A brush that fits properly ensures comfort, better reach, and a more effective clean. In fact, about half of cleaning problems come from poor sizing. Getting the right fit is essential to achieving Autobrush’s exceptional clinical results at home.
We make it simple with two easy ways to find the right size.
Adult Sizing
Kid Sizing
Watch Dr. Younan, our Chief Dental Officer as he explain how to find the right Autobrush head size for kids and adults:
Kid Sizing
Option 1: Age & Tooth Growth Sizing Guide
Our brush heads are designed for different growth stages and mouth sizes:
3-5 Brush Head (38mm x 56mm)
- Best for most 3-5 year olds
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Fits kids with 2nd primary molars partially grown
- Sizing note: Once permanent molars start erupting, it's time to size up!
6-8 Brush Head (43mm x 65mm)
- Best for most 6-8 year olds
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Fits kids with 2nd primary molars and 1st permanent molars
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Not designed for children with 2nd permanent molars
9-12 Brush Head (49mm x 75mm)
- Best for most 9-12 year olds
-
Fits kids with 2nd primary molars and 1st permanent molars
- Same size as the adult small brush head
Kid Sizing Option 2: The Bread-Bite Test
Still unsure? Try this employee-recommended trick:
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Grab a slice of bread
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Bite down to leave an imprint of your teeth
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Measure the width and height of the bite mark (using a floss)
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Compare the size against our brush head dimensions above
This method helps you match the real size of your mouth with the right brush head.
Adult Sizing
Adult Small (49mm x 75mm)
- Same size as the 9-12 brush head
- Best for adults with smaller mouth arches, narrower jaws, or those who find Regular too large
- Commonly recommended for women or adults with petite mouth sizes
Adult Regular (55mm x 85mm)
- Best for teens and adults with fully erupted permanent molars
- Provides full coverage for a wider arch
Adult XL (60mm x 92mm)
- Largest available size
- Best for adults with wide arches or larger jaw structures
- Available upon request (Email customercare@autobrush.com)
Sizing Tip: When changing sizes, most requests are for a smaller brush head, not larger. When in doubt, start smaller for a more comfortable fit.
Signs You Have the Wrong Brush Head Size
1. Poor Fit in the Mouth
- The head feels either too loose or too cramped when you bite down gently
- You have to force it into place or it doesn’t seat naturally around both arches
- The bristles don’t make consistent contact with the teeth and gumline
2. Uneven or Incomplete Cleaning
- You notice plaque left behind, especially on the back molars or gumline, even when following the approved side-to-side + figure 8 motion
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Certain teeth feel untouched or still “fuzzy” after brushing
3. Discomfort While Brushing
- Jaw strain from having to open too wide or not wide enough
- Pinching or rubbing on the gums, cheeks, or palate
- The brush head feels bulky, making the brushing technique awkward or impossible to do smoothly
5. Bite Pressure Problems
- You need to clamp down hard just to hold the brush in place
- Or, if you close gently as instructed, the head feels unstable and shifts around
- Either scenario prevents the brush from moving correctly and breaks the clinical technique
Still Not Sure? We Can Help.
Choosing the right size matters and we make it easy:
- If the size you ordered doesn’t fit, we’ll always allow you to change it.
- Our customer care team can guide you to the perfect fit: customercare@autobrush.com.
👉 For a full breakdown, visit our Support Page.
The right brush head size = the best brushing results. Whether you use our age-based chart or the fun bread-bite test, finding the perfect fit will make brushing easier, more comfortable, and more effective.
