What is the fastest way to get rid of cavity without dentist?

There is not a : Safe or effective way to "self" treat your cavities. Please see a dentist to receive professional care.

No home remedies: There are no home remedies or cures for rotten teeth. No magic pills or rinses or mouthwashes. Toothaches need to be treated locally by a dentist, someone who has years of experience treating these conditions. The sooner you call the sooner you will feel better. Please don't delay, the pain may soon be unbearable.

Dental treatment: is the only option for your dental care. There are no natural remedies that can help fix tooth decay.

There isn't : Decay needs to be removed physically by a dentist. It is irreversible but treated easily with a filling depending on depth and width.

There aren't any. There is no homeopathic, OTC, supplement, band-aid, ointment, mouth wash, voodoo, moonstones, toothpaste, or prescription that will treat an infected tooth (cavity). The infected part of the tooth has to be physically removed and the tooth restored normal shape/size/function. Please see a dentist for safe, effective, esthetic treatment.

A cavity is like any other disease but it is in the mouth. Diseases have to be treated by professionals in order prevent further problems. Only a dentist can help you with this cavity and possibly others you may have. You can not get rid of cancer or diabetes and high blood pressure without seeing a doctor for treatment.