Not a dentist, but if you can find a toothpaste with calcium phosphate in it that could help, brush very gently and spit but don't rinse, or even just rub a little on. Chew sugarless gum (xylitol) to keep your saliva flow up, it'll help with remineralization. When you're not using other products try a fluoride mouth rinse or a little toothpaste to keep high fluoride concentration in your mouth - basically any time you are not actively eating or drinking try to have fluoride available in your mouth to help rebuild enamel.