Necessity of criminalization

The second part of Dr. Hossein Borjian's talk about subgingival scaling with ultrasound

Subgingival scaling with ultrasound:   What is the necessity of dental scaling? The second part in the upper part of the gums is accessible to humans for cleaning, brushing and maintaining hygiene. It is in the gingival groove and under the gum, which is difficult to clean. or with methods such as modified bass method