Try some toothpaste with Novamin
, or GC Tooth Mousse. Consider altering your diet as mentioned in Nagel's book to Cure tooth decay
(based on Weston Price's ideas, see Weston Price Foundation online). Nagel's book is worth the $10 you buy it for in Kindle
I'm having the same problems and I'm trying to get my teeth to remineralise rather than getting it filled, only to have the problem reappear in 5 years.
Make sure you rinse your mouth anytime just after you eat.
Good luck and keep us posted.