I can vouch for this toothpaste (it's called Repair & Protect). After about a week of use, no more pain when eating or drinking cold things. It had gotten so ba

I can vouch for this toothpaste (it's called Repair & Protect). After about a week of use, no more pain when eating or drinking cold things. It had gotten so bad that I could hardly swirl even lukewarm water (do see a dentist too though if you have problems). There are independent studies confirming the efficacy. The active ingredient binds to dentite and forms a protective layer, which lasts about a day. It's OTC in Europe but afaik on prescription in the US. Maybe buy it from an EU web shop, it's no more expensive than a regular toothpaste.