• Understand all of the instruments, materials and apparatus needed for every treatments (scaling, filling/veneer, extraction, root canal treatment, orthodontic treatment, crown/bridge/denture, whitening, minor oral surgery (MOS)).• Understand and followed the pace movement every dentists during assisting• Had given responsibility to be a first assistant, 2 months after starting worked (during probation time).• Prepare all the materials and instruments beforehand the treatment started.• Assists patient to the radiography room and explained them the right position during taking an X-ray.• Able to handle the patient that scared during treatment especially children.• Make sure to sterilize all the instruments before use for treatment.• Prepare mold of teeth for braces, denture, crown /bridge.• Make the retainer, mouth guard from the mold that had been stoned.• Make sure the surrounding of clinic clean and safe.• Keep the stock checked every month.• Discuss any problem arises regarding the stock checked.• Trained new assistant beforehand giving them responsibility to be a first assistant during treatment.