I am a dental assistant. I think anyone with dental issues should see a dentist. Trying experimental things will likely result in your problem getting worst and requiring more aggressive and expensive treatment to fix down the road.
If you are interested in improving your dental health, and perhaps arresting dental decay, check out the work of Dr Weston A Price. He was a dentist in the 1930’s that discovered the ultimate cause of tooth decay, which starts from within.
The current theory of tooth decay (according to dental profession) is that bacteria consume the carbohydrates you eat and produce acid as a byproduct of their metabolism which decays teeth. While I believe this process is certainly involved in dental decay, the tooth must be susceptible first.
*** Dr Weston A Price discovered that inadequate nutrition/internal imbalance is the ultimate cause of dental caries.***
I strongly recommend you look into his research if you want to improve your dental health naturally.
Yes, tooth decay is an internal problem, not a ‘topical’ problem (bacteria on teeth)! I wish the dental profession knew more about this.
Comfrey has antimicrobial properties which may be why it helped a user above with pain they were experiencing. The fact that this individual had pain indicates the problem was more than just a cavity - the decay had probably gotten into the pulp chamber of the tooth and resulted in infection. A root canal or extraction would have been needed for this tooth likely. Comfrey may have helped ease the infection I suppose? I do NOT recommend this as a substitute for professional dental care. It will not ‘heal’ your cavity. Just because the pain is gone, doesn’t mean the problem is gone.
When it comes to the question: ‘can you heal cavities’?, You have to define ‘heal’. A gaping hole in your tooth will NOT fill in. Enamel is a non vital tissue. While it does have the ability to remineralize to a degree, complete loss of enamel will not and can not grow back. It is not a living tissue. Dentin (layer of tooth beneath enamel) can create more dentin from pulp chamber inwards, as a protective measure for the tooth in case of injury from deep decay, for example.