New Gel Restores Dental Enamel and Could Revolutionise Tooth Repair
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A new gel that restores dental enamel has been developed, but the community is divided on its potential impact and validity, with some expressing skepticism about its commercial viability and others discussing existing alternatives.
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- Cancer
- Tooth regrowth
It feels like it won’t ever be done for some reason
+ Alzheimer’s cure
+ Hair regrowth
...they were persistent vaporware or scams, then suddenly they were real and everywhere. Hopefully that happens for the others too?
They've had those for decades. It's called meth.
One-and-done HIV protection in infants - https://news.ycombinator.com/item?id=44736988 - July 2025 (First author of the paper even commented here at the time: "labanimalster - First author here. We solved a 30-year problem in gene therapy by leveraging neonatal immune tolerance. A single AAV vector injection encoding HIV antibodies achieved 89% success in newborns vs 33% in 2-year-olds, with protection lasting through adolescence. This could transform HIV prevention in regions where maintaining regular medical care is challenging. Happy to answer questions about the science or implications.")
US FDA approves Gilead's twice-yearly injection [lenacapavir] for HIV prevention - https://news.ycombinator.com/item?id=44312729 - June 2025
there are more articles about advanced tumors being shrunk to nothing than before (based on my personal monitoring)
Also, everyone has teeth issues, whereas hair issues are mostly limited to a subsection of the population (older males, and not even all of them).
Those men will pay lot of money to get back their hair though.
If I not mistaken it was Bill Gates who said more money is spent in hair regrowth research compared to vaccine to prevent diseases like malaria which kills thousand of people.
(Should have taken better care of it when I was younger and not ignored the massive hole that was growing in it. Chalk it up to a bad dental experience as a child and 25+ years of avoiding dentists as a result...)
Just in case you need someone to, y’know, empathise with you.
I have a lot of people in my life who don’t understand why I don’t just go to the dentist
I'm pleased that I found a good dentist and I've been able to overcome my anxiety. I recognize that I'm lucky in this regard.
I was also lucky in that, aside from this one problem tooth, my oral care regimen in my 26 years of not having regular dental care were sufficient to prevent any further issues. I expected to come out of that first checkup with massive problems (even though I'd never had any pain or issues) and I was pleasantly surprised.
All in all I think I'm very lucky. I tried to take care of my teeth on my own, and largely succeeded, but I do wish I'd taken care of this one problem tooth before it was too late.
That said, the progress has indeed been miraculous. A great example of the capabilities modern medicine.
Depending on the type of cancer, we now have cures or treatments that stave off death for years.
My wife has a rare type of cancer with not much research thrown at it, and even her type of cancer went from a median time of survival measured in months to several years.
Cancer treatment varies by type of cancer but many have dramatically improved outcomes.
Plenty of cancers have become manageable with the advent of immunological treatments.
Tooth regrowth seems to be the most complicated of those three, which isn't even surprising, given that it is basically organ regeneration.
[1] https://en.wikipedia.org/wiki/Dental_floss#Efficacy
Furthermore, correlation is not causation and it could well be the case that flossing is associated with better outcomes without causing it. For example, people who can afford to go to the dentist regularly are therefore regularly told to floss. People who care about dental health in general probably floss more, but also may be doing other things, consciously or unconsciously, to improve outcomes. Gut (and perhaps mouth) bacteria have behavioral effects; perhaps flossing is caused by having healthy mouth bacteria!
(at least one study says mouthwash is better than floss. That seems obvious to me! liquids are smaller than floss.)
In other words, mouthwash offers short-term hygiene benefits but should probably not be used daily unless medically indicated. The oral microbiome matters more than we thought, and indiscriminately nuking it has downstream effects.
> Starting a flossing regimen after not having one tends to cause pain--isn't that a signal to stop?
Moderate exercise after not exercising for a while causes pain - is that a signal to stop?
re: dental in particular - It seems like enamel regeneration and stem-cell-based tooth replacement have both been in the news year-after-year without applications actually coming to market.
Na, that’s the working class turkey teeth crowd.
Really? This sounds more like someone's plan to get grants to research stem cells than someone's plan to repair (or replace) teeth.
We already have a natural ability to grow new teeth that replace existing ones. Everybody does it... once. Where's the research into getting it to happen again?
> Primary (baby) teeth start to form between the sixth and eighth week of prenatal development, and permanent teeth begin to form in the twentieth week.
So it's probably too late for you.
What's the argument here? You don't think I'm going to live for another 8 years?
Here's an example of one from earlier this year at King's College, London: https://www.kcl.ac.uk/news/lab-grown-teeth-might-become-an-a...
> Uterine sensitization-associated gene-1 (USAG-1) deficiency leads to enhanced bone morphogenetic protein (BMP) signaling, leading to supernumerary teeth formation.
[1] https://pubmed.ncbi.nlm.nih.gov/33579703/
There is a lot of hyping of results in medicine papers in general but its not really their fault. The entire academic world is being forced to publish or die as governments look to measure results from the science they instead get what is measured and everyone has to embellish the importance of what they found and always find positive results.
It sounds like they're running it like a business.
This eventually leads to competitors taking over and those business failing, which usually results in people losing their jobs.
When governments get equally incapable, and competitors take over, it tends to be a lot more violent.
If only that fairytale were true. In the real world bloated inefficient companies bribe government, install themselves into government agencies directly (regulatory capture), and hire lobbyists to write laws which protect them from pesky upstarts through unchecked anti-competitive practices and anti-consumer regulation allowing them to stay wealthy and in power forever while killing off innovation and progress.
Comments like this always seem to lead to calls to give the government greater power to rein in those companies.
I'm not claiming these abuses don't exist. But there's no reason not to also look at them as the government getting a lot better at taking advantage of companies, to protect their offices. If you look at it in this context, it should be clear that increasing regulatory authority is far from a solution: it's actually counter-productive, creating tools to facilitate ever-greater abuses.
IBM's stock price is 10 times what it was in 1991. What the hell have they even done in that time?
They don't have to be whatever you think is "industry leading in computing", because apparently just once being worth something was enough to enrich an entire generation of management while the rest of us struggle.
>Ford
Despite decades of failure that led to their struggles in 2008 and an increase in energy costs, they didn't die, and despite then selling several lines of cars that had serious defects that should no longer happen, they abandoned selling anything other than overpriced trucks and are STILL doing just fine.
>Sears
Sears was murdered to enrich a few already wealthy people. At no point did it do worse business.
Do you know which companies you didn't even mention that do not support your claim? All the gigantic conglomerates that own you.
From Disney owning a giant chunk of all media and setting national IP policy, to Sysco being one of the only food service companies because they ate all the other ones so now every restaurant is stuck selling the same food as most prisons, to Nestle owning most of the grocery store so they can sell you water that they pumped out of your aquifer for crazy rates while complaining they couldn't be profitable without slave labor, to Dupont poisoning the entire earth, to fossil fuel companies that set national energy policy, to most farming in the US being beholden to a single legal entity, to the vast majority of "Brands" in the US just being a label change of a product they did not design.
You seem to be under this absurd notion that as long as the brand name on a couple consumer items changes occasionally (due to the kinds of technological innovations that we will never see again and cannot be predicted or relied upon), everything is fine?
You can argue that it's overall bad for the economy, but I think you're missing the arguement.
The escalation in costs have come from: - Incentives around US News College rankings (and the amenities that drive the rankings) - Administrative (non-teaching, non-research) bloat
Research is definitely in need of reform though, but not sure these outcomes are actually causal or even corrilated.
Hey, good point. We should really bring back that 90% top tax bracket rate to get the government back to being financially solvent again.
It's a spending problem. You're anchoring on a talking point with out actually running numbers.
Don't believe me, run the numbers yourself.
From what I can see, taxation as GDP percentage was never really under 10% since 1950, while big cuts to the top tax rate happened in the 60s and 80s (and the federal budget was continuously in the red since mid 70s basically, with one brief exception before 2000).
Just to add some empiricism to the conversation
Fiscal Year Tariffs/Customs Individual Income Corporate Income Top Marginal Rate Receipts (% GDP)
-----------------------------------------------------------------------------------------------------------
1928 14.0% (approx) DNF DNF 25.0% DNF
1935 8.4% 14.6% 14.7% 63.0% 5.1%
1940 6.1% 13.6% 18.3% 81.1% 6.7%
1944 0.9% 45.0% 33.9% 94.0% 20.5%
1952 1.2% (approx) 42.2% 32.1% 92.0% 19.0%
1960 1.3% (approx) 42.0% 23.0% 91.0% 17.8%
1970 1.1% (approx) 46.0% 18.0% 71.8% 17.9%
1980 0.8% (approx) 47.0% 12.0% 70.0% 18.9%
1990 1.3% (approx) 45.0% 9.0% 28.0% 17.8%
2000 1.1% (approx) 49.0% 11.0% 39.6% 20.0%
2010 1.2% (approx) 41.0% 9.0% 35.0% 14.6%
2015 1.3% (approx) 47.0% 10.0% 39.6% 17.6%
2019 2.0% (approx) 50.0% 7.0% 37.0% 16.3%
-----------------------------------------------------------------------------------------------------------
DNF=Did not find
- Tariffs fell from ≈14% of receipts in 1928 to <1% by WWII -> income taxes replaced trade duties.
- Individual income taxes overtook all other sources after 1943
- Corporate shares peaked during war mobilization (~⅓ of revenue in 1944–52).
- Top marginal tax rate was surprisingly not too corrilated to government revenue.
(REALLY wish HN did basic markdown formatting)
It's important to note that "eventually" usually takes so long that it might as well be forever.
The problem is some people prefer an academic lifestyle in exchange for doing performative research.
Yes there are other actors eg politicians demanding performative productivity, but mostly it’s the inmates running the asylum.
Academia is one failed western institution amongst many, and those failures are ultimately directed by the actions of the individuals that comprise those institutions.
It is like saying, if everyone stops subscribing to OnlyFans or liking spicy pics on Instagram, it will go away.
There will always be sycophants willing to do "performative research" or ... other things.
Academia is beyond broken.
The bad drove out the good.
Right, and the prisoner's "dilemma" isn't a real thing; everyone knows it's their own fault for not just all picking the decision that gives them all the best outcome. Every individual within a network effect is obviously responsible for the outcomes the entire system produces.
If you're willing to blame someone for not acting against their own individual interest, doesn't it make more sense for it to be the people who are going out of their way to reward others for acting in that way?
[1]: https://en.wikipedia.org/wiki/Collective_action_problem
Evolution creates a situation that encourages all sorts of terrible actions, and the vast majority of people choose to control their animal instincts.
Additionally: the people who encourage the performative research are the people who control grant review. And those people are the same people as the performative researchers.
A bunch of people figured they could make a career doing bs performative research and corrupted the whole system to serve them.
Arguably America is the pinnacle of this right now, where (many) politicians and (many) business leaders now feel justified do whatever's legal just to score points. I would argue this type of thinking was birthed in the UK though under Thatcher who as a first step removed the general trust in (civil servants in her case) your fellow human beings. Blair then came up to replace that trust with KPIs.
We need to get back to a world where we trust people to do the right thing - without measuring their success in short-term KPIs.
https://clinicaltrials.gov/search?aggFilters=phase:3,status:...
The potentially easier way at least to get a lay of the land is to follow pubmed (https://pubmed.ncbi.nlm.nih.gov/) for the topic you are interested in, if you then look into those papers you will find funding statements as well as the place the research was conducted and use both to build up a picture of the origins of research in a field.
Afraid I don't know of an easier way not a generic one anyway. Sometimes you just have to follow the right person on twitter who announces trials or studies or be at the right conference. Start with pubmed and the output papers and that will get you started. Then also have a search on the NIH and that might lead you to some links to groups and institutions they fund.
Says nothing about endemic reproducibility crisis of the social sciences.
Since student loans have been basically guaranteed (bankruptcies can’t erase student loan obligations, in an attempt to push rates lower) and tuition steeply rose, academic institutions’ ratio of administrators to students has skyrocketed to a bureaucratic mess, leading to a flywheel of higher education costs and incentivizing research for money’s sake over impact to the field.
Real impact would be reproducing notoriously iffy studies, but that doesn’t bring in the dollars.
https://www.ebay.com/itm/127083185095
"proven to strengthen tooth enamel" I remember researching the stock and deciding not to buy.
Patents from the 1990s https://patents.justia.com/assignee/enamelon-inc
It seems the company is still around https://www.enamelon.com
_EDIT: “repair and protect”_
https://news.ycombinator.com/item?id=36564190
I'm going to try Boka as recommended above though, it seems like a more updated and modern solution.
https://www.sciencedirect.com/science/article/abs/pii/S03005...
[1]https://www.science.org/doi/10.1126/sciadv.aaw9569
https://www.technologyreview.com/2007/02/22/272845/regrowing...
As it turns out, this is really hard to do. There are a lot required of teeth: they have to be extremely durable to resist repeated strain of chewing ,stay in the gums, not be rejected by body, etc. It's little surprise progress has been so slow.
[0] https://news.ycombinator.com/item?id=44922571
on the neuroscience side, off the top of my head, the most impactful things have been better anticoagulants and preventive care for stroke, monoclonal abs for autoimmune diseases like MS/myasthenia, , certain stereotactic brain surgeries, and such. But considering what ails most people, the overall population effect probably is minuscule compared to say better crash safety in automobiles.
You must be new
I was about to comment the same thing, I feel like I've been seeing this talked about since the 90s
Is this a press release from a university research group, as it appears to be (the site is down)? Then it's nearly meaningless.
https://fourthievesvinegar.org/tooth-seal/
They have a video with some more info here: https://pt.fourthievesvinegar.org/w/9aa66b49-2ec5-497f-9f49-...
And apparently the use of NSF does have a bunch of research papers written about it: https://www.researchgate.net/profile/Amol-Patil-43/publicati...
But an actual medical product for sale to consumers that makes claims like "restores dental enamel" would have to present scientific evidence to the FDA that this claim is accurate.
show us the study
- Sensodyne Repair and Protect contains 'NovaMin' (possibly only in some markets; check the ingredients!)
- NovaMin is the brand name for calcium sodium phosphosilicate
- It reacts with saliva to form a physical layer of hydroxyapatite on your teeth
- This layer blocks the tubules that trigger pain from temperature and such
- It also supports remineralization (how exactly?)
Unfortunately it isn't actually available where I live (US), and I had to buy it from Canada... from a shop that hasn't had stock for more than a year now. I've tried ordering from other countries, but haven't found anyone else who will ship to the US.
I've tried the "BioMin Restore" toothpaste that is available in the US, and I don't feel like it's doing much of anything, but... again, not sure I'm qualified to evaluate.
Btw, what really drives me crazy is that Elmex sells multiple different sorts of tooth paste with the colors green and violett, each. How can a company confuse their customers so much that they buy a tooth whitener paste instead of a remineralizing one? Did the mistake twice...
https://www.jeancoutu.com/en/shop/categories/personal-care/o...
https://www.walmart.ca/en/ip/Sensodyne-Repair-Protect-Sensit...
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