Other than the Additional Tip: "use the toothpaste with Fluoride" (which I don't believe in. too much controversy about the type of Fluoride being used in tooth products), I find lots of solutions in this post for supporting healing cavities naturally.
How to Reverse Cavities Naturally and Heal Tooth Decay - Dr Axe
Teeth Health, Dental Health, Oral Health, Dental Care, Healthy Teeth, Reverse Cavities, Heal Cavities, Teeth Care, Cavity Healing
Get Rid of a Cavity and DIY toothpasteAmazingly Simple and Effective Homemade Toothpaste 1 part Baking Soda 1 part colored mineral salt, we use Celtic Sea SaltÂ® or Pure Himalayan (not the white refined) For a creamy paste: 1 part Coconut oil to the mix