Is the dentine in the cavities hard and painless with no sensitivity - if so, no need to fill...Just keep very clean by swishing oils like virgin coconut oil, neem oil, tea tree oil before brushing teeth.
Do you eat organ meats every day, in moderation? Do you have access to vitamin D, either photosynthesised or supplemented to the tune of ~5,000-10,000 IU? What about vitamin K2 (WAP's "activator X") intake from livers, pastured eggs, butter oil and LifeExtension's synthetic Super K (1g per cap)? What about bon-building minerals for hurrying re-mineralisation along?
Fat uptake is important for assimilating fat-soluble vitamins A, D, E, K2 - bile sufficiency is naturally part of the dynamic.
Also, WAPF reckons that glycine, proline and hydroxyproline (from collagen/gelatine) are very valuable for bone building, along with the fat-soluble vitamins and abundance of minerals. Bone/cartilage broths would be ideal, except they're cooked and contain the potentially excitotoxic neurotransmitter glutamic acid in free form - that can initiate a nasty glutamate over-excitation in conditions of sensitivity (I'm sensitive, probably for various reasons like a history of PUFA abuse).
Maybe bone meal washed down with french green clay in water is a good source of minerals.
Also, balancing the endocrine system could be another dimension in healing teeth/bones. Whatever you do, stay away from x-rays of the teeth/jaw - I reckon that's one of the things that weakened my tooth structure.