I use the Biorepair night creme(it's actually Hydroxyapatite and Xylitol) and sometimes the sensodyne repair & protect(keep in mind that the German version does not include novamin)

When my root was exposed I did apply clove oil and completely refrained from simple carbs for the treatment and after until it healed.

EDIT: a lot of Japanese tooth pastes also have it by the way and there is no real guarantee that it works, but theoretically it's supposed to fill microabrasions temporarily.