Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Toothpaste made with keratin may protect and repair damaged teeth: study

kcl.ac.uk

Post reply on HN
Print view View original

151–160 of 225 posts

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#151

Post by rapnie »

dfxm12 wrote: post #135
vinni2 wrote: post #126

Earlier quoted context omitted.

I guess it implies human hair.

FWIW, I did not assume human hair.

In the Dutch public TV program "Keuringsdienst van Waarde" they had an episode about bread improvement ingredient (keratine) and traced it down to being sourced from human hair collected at hairdressers in China. Sounds disgusting of course, but many raw materials are, and after processing industrial grade pure keratine is the output.

https://www.bnnvara.nl/joop/artikelen/chinees-mensenhaar-ver...

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#152

Post by tsimionescu »

inglor_cz wrote: post #145
abathur wrote: post #99

Earlier quoted context omitted.

Not deeply knowledgeable here but imagine this depended quite a bit on where you were living in 1100 CE. I think it was fairly rare in Europe, but IDK how well those numbers capture what was common for the majority of the human population living elsewhere.

It was pretty rare even among medieval kings to live to be 70. The first English king to be definitely alive on their 70th birthday (though no longer "in office") was Philip of Spain (jure uxoris) in 1597, so not a medieval king. That is Early Modern Age. Elizabeth I. didn't make it, though barely, and so the next to reach 70 was George II. in November 1753! Only since the second half of the 18th century is it common…

Medieval kings were warriors and very often victims of assassination, so they had a way lower life expectancy than a typical peasant of their times.

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#153

Post by abathur »

inglor_cz wrote: post #145
abathur wrote: post #99

Earlier quoted context omitted.

Not deeply knowledgeable here but imagine this depended quite a bit on where you were living in 1100 CE. I think it was fairly rare in Europe, but IDK how well those numbers capture what was common for the majority of the human population living elsewhere.

It was pretty rare even among medieval kings to live to be 70. The first English king to be definitely alive on their 70th birthday (though no longer "in office") was Philip of Spain (jure uxoris) in 1597, so not a medieval king. That is Early Modern Age. Elizabeth I. didn't make it, though barely, and so the next to reach 70 was George II. in November 1753! Only since the second half of the 18th century is it common…

Was this meant for someone else?

I did not dispute that this was likely rare in medieval Europe (for the same reason you cite).

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#154

Post by card_zero »

1718627440 wrote: post #131
Birch-san wrote: post #93

Earlier quoted context omitted.

“Windows Subsystem for Linux” is probably the most confusing example of this (an environment subsystem which provides a Linux userspace to a Windows NT kernel). more intuitive would be to call it a Linux Subsystem for Windows, but presumably for branding purposes they wanted Windows in front.

That one isn't an example of this. It is actually a Windows Subsystem (at least WSL1) that exposes Linux syscalls, so is for Linux userspace programs. There is also the Windows Subsystem for Win32 and there used to be a Windows Subsystem for Unix. Linux Subsystem would be completely wrong, because it is a Subsystem of Windows not of Linux.

No it wouldn't. Following the scheme a couple of comments above, we have:

Y of X providing Z - Windows Subsystem for Linux.

Y providing X on Z - Linux Subsystem for Windows.

The former is "for [having]", the latter is "for [use on]".

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#156

Post by buybackoff »

alyx wrote: post #149
buybackoff wrote: post #66

The picture says "enamel-mimicking" and the text says "protective coating that mimics the structure and function of natural enamel", so it looks like a protective layer, not true repair. I've been using a paste with novamin lately, it also creates a protective layer and is also marketed as "repair". I like it and feel some heat when it contacts with teeth, so the chemical reaction must be working. But the marketing l…

Never heard of Novamin but doesn't look promising? https://pmc.ncbi.nlm.nih.gov/articles/PMC7068624/ Conclusion Review shows that Novamin has significantly less clinical evidence to prove its effectiveness as a remineralization agent in treating both carious and non-carious lesion. Hence, better designed clinical trials should be carried out in the future before definitive recommendations can be made.

Inetersting, the paper explain how remineralisation works and the role of F and fluoroapatite. This reminds me the recent Veritasium video about why Teflon is so strong - F chemical bonds are the strongest.

For Novamin alone, I've seen and understood the claims of sensitivity protection with hydroxyl-carbonate apatite (HCA). The paper explains it in 4.3. The layer is temporary and protects from acids, conserving the teeth tissue below.

But F is essential and my paste has it together with Novamin. It seems they may work well together. But the paper also explains that F works with saliva rich in minerals to repair the enamel. So if Novamin creates a strong layer, it may block access of F + saliva to enamel (my speculation, as in 4.2 they say "A clean tooth surface is required to access the mineral-deficient spot.").

So maybe a classical Ca+F paste is better overnight when no acid exposure is expected, but Novamin is nice in the morning before breakfast.

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#159

Post by skylissue »

CGMthrowaway wrote: post #138

How does this compare with nano-hydroxyapatite, which is the current rage in toothpaste innovation and remineralization?

nHA is prohibitively expensive to produce and the most effective process that produces the smallest particles is patent-protected by Sangi, and therefore many nHA toothpaste brands only contain a fraction of the concentration used to produce the effective results reported in academic studies (1-2% instead of 10%).

If keratin toothpastes can be produced more economically they could be a better option for mass adoption. For anyone who wants to try nHA toothpaste for remineralization, I can only recommend Sangi Apagard Royal toothpaste ($$$) but it does work quite well when used as directed.

Re: Toothpaste made with keratin may protect and repair damaged teeth: study

#160

Post by yieldcrv »

latexr wrote: post #71

I’ve been reading about how “X could repair tooth enamel” for years , including on HN. Nothing ever comes of it. I’ll believe it when something exists out of a laboratory and on the market. > The treatment could be delivered through a toothpaste for daily use or as a professionally applied gel Could . In other words, they haven’t even tested if a toothpaste is viable, yet the title is written as if this is a ready-ma…

Only thing missing is a B Corporation certification so that otherwise smart people won’t recognize the grift
Post reply on HN