Italy Qahtani (cattani) company is specializing in the production of vacuum pump and compressor pneumatic products. In the field of oral central negative pressure is have a complete product line (1-500 treatment machine from work at the same time) from various types of saliva suction tube to all kings of saliva suction system with cleaning and disinfection products are produced. The central system has a saliva suction leading position in Europe beyond all dispute. Central ceiling saliva system to ensure the cleanliness of the dental clinic, no smell, and avoid the occurrence of cross infection.