Brush teeth with a mixture of 2 teaspoons of clove oil and a ¼ teaspoon of black pepper powder and avoid the problem of tooth cavities. Also, you can apply clove oil with a cotton swab on the affected area. This will reduce the pain from the cavity.
Prepare a mixture with 4 teaspoons of lemon juice and half a teaspoon of asafetida powder and rub teeth using a cotton pad. Do this every day to reduce the tooth cavity problem. Another thing you can do to treat cavity is chewing a slice of lemon with its skin or to brush teeth with lemon juice to obtain quick relief.