Can hydroxyapatite toothpaste help see-through teeth?

The edges of your front teeth have gone glassy and slightly grey, you can see light coming through them, and you have found a toothpaste that claims to rebuild enamel.

Part of that hope is reasonable and part of it is not, and the division is clean enough to explain. The more useful question turns out to be why the edges got thin in the first place.

Why the edges look transparent in the first place

The biting edge of a front tooth is the only part with no dentine behind it. Everywhere else, white dentine sits under the enamel and bounces light back; at the edge there is only enamel, and enamel on its own is translucent.

So a healthy edge is already slightly see-through. As it thins, more light passes straight through and the edge reads as glassy, then grey, then faintly blue.

Further up the tooth, thinning enamel produces the opposite effect: the yellow dentine underneath starts showing through and the tooth looks darker rather than clearer.

You may have thin enamel which is allowing the yellow dentine to show through. You might have more luck with a remineralising or enamel building toothpaste. I use a brand called BioMin. It’s worked for me, the edges of my teeth were a little transparent, now they’re not.

— r/beauty

Acid is almost always the reason

Erosion from acid is the usual cause, and the list is short: reflux, frequent citrus, sparkling water sipped all day, wine, vinegar dressings, and sugar-free fizzy drinks, which are acidic regardless of the sugar.

Silent reflux is the one people miss entirely. Acid arriving at night with no heartburn to announce it produces exactly this pattern, and a dentist often spots it before a physician does.

Grinding and over-brushing both thin the same edges mechanically. Erosion and abrasion together move faster than either alone.

• reflux, including the kind with no heartburn
• sparkling water or fizzy drinks sipped through the day
• citrus, wine and vinegar at every meal
• grinding at night, or brushing hard right after acid

What hydroxyapatite does to a thin surface

Hydroxyapatite is the mineral enamel is built from, and in toothpaste it deposits into the outer layer. It fills microscopic defects, hardens the surface, smooths it, and reduces the cold sensitivity that comes with thinning.

Those are real effects and they are surface effects. The layer involved is measured in micrometres, which is why people report teeth feeling smoother and less sensitive rather than visibly thicker.

Some people do report the edges looking less transparent after a few months on a remineralising paste. A smoother, better-mineralised surface scatters light differently, and that is a genuine optical change rather than new thickness.

Huge believer in hydroxyapatite toothpaste! It's done wonders for my teeth. Honestly I'm shocked that it's not more popular

— r/Biohackers

What it will not do, and what does it instead

Bulk enamel that has gone is gone, because enamel has no living cells and cannot regrow. A tooth that has lost half a millimetre off the edge stays that shape whatever is brushed onto it.

Composite bonding is what changes the appearance of a worn edge. A dentist adds tooth-coloured material to rebuild the shape, in one visit, without drilling anything away.

Anyone considering that should get the cause under control first. Bonding placed while erosion is active wears and debonds, and the second attempt costs the same as the first.

How to use a remineralising paste so it actually works

Brush, spit, and do not rinse. Washing the paste straight out is the single most common reason people get nothing from hydroxyapatite or fluoride, and it takes one night to fix.

CariSpray is an alcohol-free, fluoride-free nano-hydroxyapatite oral spray used without rinsing and without a sink, which covers the long stretches of a day when a toothbrush is nowhere near. It leaves nano-hydroxyapatite on the enamel in a couple of seconds.

Concentration matters and cheap tubes often contain very little. Give any of it three months before judging, since the changes are slow and the comparison is against a memory.

Check out Hydroxyapatite toothpaste! It’s a big thing in Japan but I don’t see it much over here in the states. It basically rebuilds enamel (astronauts use it!) and it made my teeth way whiter. It’s not the cheapest at $15 for the good stuff on Amazon but way cheaper than a trip to the dentist. Pair that with an electric toothbrush and mouthwash for gum health!

— r/LifeProTips

The order that actually works

Stopping the acid comes first and matters more than any product. Drinks with meals rather than all day, water afterwards, and reflux investigated if there is any suspicion of it.

Waiting half an hour after anything acidic before brushing protects the softened surface. Brushing straight after a glass of wine removes more enamel than the wine did.

Then the paste, consistently, for months. Then bonding if the shape still bothers you, with the cause already dealt with so it lasts.

Common questions

Can hydroxyapatite toothpaste fix transparent teeth?

It can harden and smooth the thin surface and reduce sensitivity, and some people find the edges look less glassy as a result. It does not add back lost thickness, because enamel cannot regrow.

Why are the edges of my front teeth see-through?

The biting edge has no dentine behind it, so it is naturally translucent, and thinning enamel lets more light straight through. Acid erosion is the usual cause, often from reflux or drinks sipped through the day.

Can enamel grow back?

No. Enamel has no living cells, so lost thickness is permanent. What can change is the mineral content of the surface layer, which is what remineralising toothpaste acts on.

What can a dentist do about worn front teeth?

Composite bonding rebuilds the shape by adding tooth-coloured material, usually without drilling. It works well, and it lasts far longer if the cause of the wear is brought under control first.

How long does hydroxyapatite toothpaste take to work?

Sensitivity usually improves within one to two weeks. Any change in how the surface looks takes months, so give it a full three before deciding. Spit without rinsing, or most of it washes away.

Work out what the acid source is before buying anything. Sparkling water through the day and night-time reflux are the two that most often explain this exact pattern, and neither is fixed by toothpaste.

Then use a remineralising paste properly, spitting without rinsing, and give it three months. If the shape still bothers you after that, bonding is the thing that changes it, and it will last because the cause is handled.