If the cavity has just started and hasn't progressed too far then demic toothpaste may help heal the cavity.
But if the cavity has been left to progress too far then only a dentist will be able to fill in the cavity with a cavity filling.
Brushing your teeth after every meal and oil pulling once every day or every other day with coconut oil can help to prevent cavities from forming.
The coconut oil will help to get rid of bacteria in your mouth and prevent tooth decay, gum disease and cavities.
Take a tablespoon of the coconut oil and put it into your mouth and swish it around for a minimum of 5 minutes and then pull the coconut oil through your teeth.
After oil pulling be sure to brush your teeth.