The correct term for tooth decay is dental caries. Dental caries cannot be eliminated by daily brushing and cleaning, and it is necessary to use special instruments to remove the decayed tissues, and then to carry out filling treatment or restorative treatment as follows. 1. The appearance of dental caries is caused by the chronic progressive destruction of dental tissues by bacteria and other factors. Ordinary daily cleaning, such as brushing, cannot stop the destruction of caries. The cleaning of caries requires the use of special dental diggers, drills and needles to remove the decayed tissue. 2. Carious tissues contain a large number of bacteria and their products, which can cause continued destruction of dental tissues or irritation to the pulp. Removing them can eliminate the infection and irritants, and then restore the shape and structure of the dentin through filling or restorative treatments to terminate the development of caries. It is recommended to go to a regular medical institution to receive professional treatment.