I have used Biorepair Plus (with the + for more concentrated hydroxyapatite) for many months and felt improvement on teeth. This tooth paste is able to use hydroxyapatite to put back the enamel (bone) to your teeth. This tooth paste is expensive but if you are interested in lowering your sensitivity tooth/teeth issue then I would recommend this product. If you don't eat mineral rich foods then the hydroxyapatite will not do any good. If you skip a section of teeth a few times then you will know it as your sensitivity will soon return. I have checked and none of the USA brands are currently using hydroxyapatite but instead are just using ineffective fluoride. The expiration is on the end of the box or at the end of the tube as any USA brand. If you have poor/low minerals in your teeth I would recommend Apagrad M-Plus first then Biorepair Plus after you feel your teeth have more minerals.