Toothpaste is toothpaste, there is no difference! Right?

No, while I don't know how much toothpaste varies in general, I do know the effectiveness of Novamin, a product that used to be available in the US toothpastes and has been removed.

Novamin is a product that has been proven to re-mineralize your teeth more effectively than Sodium Fluoride.

So why is it not available in the US?

GSK is currently the only company in the US that sold products with Novamin. They received the Novamin technology in a $135 million trade acquisition deal. A few years ago they decided to stop selling it to consumers in all their products. Rumors suggest they were paid off by the Dental Industry or the fact it is more profitable to sell to dentists directly.

What exactly is Novamin?

"When exposed to water and saliva, NovaMin forms hydroxyapatite-like crystals that occlude exposed dentin tubules in teeth. Essentially, it compensates for damaged enamel by creating a temporary repair, both relieving tooth sensitivity and preventing new caries from forming in exposed tubules."
_{- Ten Bitcomb - The curious history of NovaMin toothpaste}

Video on the effectiveness of Novamin

Novamin is sold worldwide very successfully

Not in the US anymore, but you can get it on Amazon! The UK version of the product contains Novamin and is relatively cheap when you buy 4 at a time.

But I don't have sensitive teeth

Neither do I, my dad did, he used this product for years. Do you want to have sensitive teeth? I use it as a preventative rather than a treatment.

Want to read more?

There is a good article referenced in the quote above that has a good history of the product. The scientific paper referenced above is also a good resource on how effective it is against the standard product in US toothpastes.

Who knew toothpaste can be full of conspiracy theories right?

You can find the product on Amazon by this vendor. It is $22 for 4 tubes shipped from the UK to the US.

_{Images are from Amazon product pages unless otherwise sourced}