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Ultrasonic toothbrushes

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Meunier01/09/2019 20:47:57
261 forum posts
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My take from all the above interesting discussion - whilst not reading every link - is that perhaps the purpose of the 'special toothpaste' may be to promote the formation of micro-bubbles rather than just bubbles, which then fulfil the function of cavitation and hence cleaning. (what is the pH of this toothpaste ? ) A similar effect, perhaps, to my adding 5ml of dish-washing-liquid in my domestic ultra-sound cleaning tank which apparently lowers the surface tension of the water thus promoting the formation of more numerous, smaller sized bubbles.

Robin Graham02/09/2019 01:28:48
612 forum posts
132 photos
Posted by SillyOldDuffer on 01/09/2019 10:54:11:
Posted by Robin Graham on 26/08/2019 09:52:13:
Posted by Neil Wyatt on 26/08/2019 01:29:13:

Posted by Robin Graham on 25/08/2019 23:11:28:

The only credible candidate in the ingredient list is hydrated silica. Further research is needed!



Well, yes. But ingredients are Aqua, hydrated silica, sorbitol, glycerin, disodium pyrophosphate, tetrapotassium pyrophosphate, xanthan gum, sodium C14-16 olefin sulphonate, sodium methylparaben, sodium saccharin, aroma, CI 77891. CI 77891 is TiO2....



I don't think Hydrated Silica is the only credible ingredient


I wonder what it tastes like - I prefer peppermint!


Edited By SillyOldDuffer on 01/09/2019 10:55:31

Dave, I thought (before reading MichaelG's credible hypothesis about foaming) that Ruppel's SEM image must be of a solid structure and hydrated silica seemed the best candidate given that it's odd, amorphous stuff. Maybe I should have said 'most' rather than 'only'. Do you see an alternative if the image is of a solid in the toothpaste?

The doggy utrasonic toothpaste is indeed peppermint, which our dogs detest. We also have enzymatic (non-ultrasonic) dog toothpaste which is flavoured with 'poultry extract' - I try not to think too much about that means! Problem is they like it so much that they want to eat the toothbrush.

Sadly I didn't get the opportunity to test the brush on rust today but I did look up ultrasonic derusting in case it was a crazy idea. It seems that it should work - I'll give it a go when I can.

pgk - I reckon you could be onto a winner with your quinoa and goji berry idea. But:

The pet food manufacturer looking for new flavour ideas wasn't keen on my suggestions of Robin with Mouse flavour.

Over my dead body mate.



Edited By Robin Graham on 02/09/2019 01:32:24

Edited By Robin Graham on 02/09/2019 01:37:20

pgk pgk02/09/2019 08:25:52
1486 forum posts
285 photos

pgk - I reckon you could be onto a winner with your quinoa and goji berry idea. But:

The pet food manufacturer looking for new flavour ideas wasn't keen on my suggestions of Robin with Mouse flavour.

Over my dead body mate.


The ultimate in recycling?

You're probbaly aware that pelleted dog/cat food is an extruded mix that has the flavour sprayed on at the end of the process. They call that flavour 'digest' and while one hopes it's steam produced and analagous to boiling up a chicken carcase (or whatever) for soup then i guess the best that can be said is that its no worse than a turkey twizzler.

As another light hearted but true comment: we were given trial cans of venison cat-food which was actually god stuff asa novel protein for possible allergy cases. As usual we got sent an awful lot of cans to give away early December. I put a sign up "Feed your cat Rudolf for Christmas"


mark costello 102/09/2019 17:17:00
548 forum posts
12 photos

I always thought "mouse in a can" would be a viable idea.

Michael Gilligan11/11/2019 20:17:29
14244 forum posts
627 photos

Resurrecting this thread:

About 17 minutes into this: **LINK**

The Secret Life of Waves:

there is a short piece at University of Southampton, which may be relevant.


Robin Graham12/11/2019 23:03:40
612 forum posts
132 photos

Thanks for that Michael - interesting stuff. Keen as I was I didn't do my 'rust removal with an ultrasonic toothbrush' experiment because on reflection I thought domestic disharmony might ensue. It turned out that dog had a rotten tooth which has now dropped out - whether by nature or with the assistance of ultrasound I don't know. The animal is now chomping happily and the toothbrush has become redundant - it'll find it's way to my workshop I expect. In due course.


Howard Lewis14/11/2019 19:53:06
2440 forum posts
2 photos

Probably throwing the thread somewhat off topic, the implosion of bubbles can be quite damaging, or effective, depending on the context..

The manufacturers of engines with wet cylinder liners had problems with what was called "waterside attack". This caused the cylinder liner to become porous, allowing coolant to make its way into the sump, via the microscopic holes in the liners. The problem was that as the piston reversed direction at top and bottom of the stroke, the skirt slapped the wall. This caused the coolant to cavitate, presumably because of minute deflections of the liner. When the resulting cavitation bubble imploded, it knocked the ferrite out of the liner.

One solution was to move the gudgeon pin off the centreline of the bore, to reduce the slap. Others chromium plated the liners, but ultimately the cavitation still made its way to the liner!

So US should be a good way to clean Fido's teeth, as long as not overdone. Possibly, water would be an effective conveyor of the US pulse, since this basically the main constituent of some US cleaning baths.

Give a product a fancy name and you can sell it for a vastly inflated price.

Or am I a cynic?


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