Hi Meera,
Yes, I am familiar with Quantum Nutrition and Bob Marshall. I am glad that you have taken this route to improve your health

) Remember that it takes time to convince the immune system to re program itself and play nice, but it will if you stick with it!
Sounds like you are doing exactly what you need to do with your oral hygiene, keep it up. You can try rinsing with xylitol as it is therapeutic and can reduce the acidity from foods that cause plaque to build up and decay to occur. Just make sure to buy a brand that is derived from birch trees and not corn as the corn is GMO and can be disruptive to your immune system... which is the last thing you need!!
Tooth sensitivity due to gum recession can improve over time if the areas are kept clean and there is no other pathology going on. You can try dabbing on liquid vitamin D3 to those areas as that may help remineralize them.