Instructables
Picture of Toothbrush to rotary tool bristle brush
Here's another take on putting a used toothbrush to good use. My toothbrush seems to wear out within a month and worse still, only the top half of the brush wears out while the bottom half seems fine. Must be something wrong with the way I brush my teeth. But not to worry, this ible is sure to put a smile back on ones face, by that I do not mean to use the rotary tool bristle brush as a substitute electric toothbrush.

Materials needed:
1. Toothbrush
2. brill bit
3. hacksaw blade or rotary tool circular saw
4. metal file or sandpaper
5. nose plier
6. pencil
 
Remove these adsRemove these ads by Signing Up

Step 1:

Picture of
It is important to make sure the final brush does not vibrate when used with the rotary tool. For this the brush needs to be symmetric in terms of weight and the mandrel needs to be attached at the exact center of a circle when the brush rotates. For example the picture below shows a possible layout.

The bristles at the four corners that the circle intersects need to be removed completely using the nose plier.

Step 2: Making the cut

The brush I actually used had a row of bristles passing through the center of the circle I wanted to use. In this case I used the nose plier to remove one of the bristle clusters from the center of the circle. The hole that was left behind I then used as the hole in which to attach the mandrel after drilling it to completely pass through the other side of the brush.

Remember to try to keep the same number of bristles / group of bristles such that it is symmetric around the center of the hole.
andertribo13 days ago

good work

pucksurfer9 months ago
Couldn't the metal screw that you screw in to the toothbrush head potentially scratch the surface or object that you are brushing?
Mojo_JoJo (author)  pucksurfer9 months ago

Not really, the length of the screw is about as thick as the toothbrush plastic base. Besides, bristle brushes are not very effective if pressed very hard against the work surface. The mandrel is a Dremel 401.

Ok. Cool instructable

Quanah9 months ago

I will have to give this a try. I use old toothbrushes with a handle for parts cleaning brushes, but now I know what to do with electric toothbrush heads.