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.
The natural toothpaste recommended to assist with the remineralization process of healing cavities. Natural Toothpaste for Healing Cavities Adapted from The Wellness Mama’s Squeezable Toothpaste Recipe - See article
How to Reverse Cavities Naturally and Heal Tooth Decay - DrAxe ".But according to a study published in the British Medical Journal cavities and tooth decay could potentially be healed or reversed with diet.