Pyongyang, August 22 (KCNA) -- Pyongyang Medical College of Kim Il Sung University invented a new dental correction device.

The existing devices are complicated in operation and take a long time in treatment.

Pae Jae Son, a 47-year old researcher of the university, told KCNA that the new invention is a very small screw which is implanted on tooth root.

It is considered a better device for dental correction.

The titanium-made screw is low in production cost and simple in operation.

It also takes a short time in treatment.

The new invention has already been introduced in Pyongyang City Dental Preventive Hospital and other dental hospitals in the country.