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I was a young child when the events and observations of these recollections occurred. (There is also a page on cleaning teeth in the early 1900s.)
For cleaning our teeth, we had a solid pink 'cake' of substance in a red, green or blue tin - our choice of colour, although there was no difference in the contents.
The toothpaste was known as Gibbs Dentifrice. We rubbed a wet toothbrush into it to make it froth, then used the frothy toothbrush to brush and our teeth. Then we rinsed out with water. I suppose it must have been dreadfully unhygienic because everyone in a family rubbed their toothbrushes over the same cake of dentifrice. However, teeth certainly felt clean afterwards. I never heard of dental floss, although the occasional use of a length of cotton came in handy at times.
Later we graduated to toothpaste in a tube, but the tube of course was metal not plastic. When squeezed, it folded into tight ridges that couldn't be smoothed out and sometimes cracked so that the contents oozed out. The best way of getting all the toothpaste out was to roll the tube up to its end. Once rolled, being metal, unlike plastic, it stayed in position.
All the toothpastes shown in the adverts were household names.