1, after playing the lower alveolar nerve, the chair will be erected, the anesthetic works much faster! 2.When scaling the upper front teeth, do not use the mouth mirror to pull, use your finger to pull the lips, which will not cause the discomfort of the patient with the mouth mirror pressure and can use your hand to block the water spray from the working head. 3.Patient’s upper posterior teeth are painful, if no carious location is found, you can pay attention to the far middle palatal neck of upper 7, which is a common but easy to ignore place. 4.Check the sealing of the cavity by spraying some water around the examined tooth and then blowing it with the air gun to see if there is any bubble, if there is, it indicates that this place has been connected with the cavity and needs to be repaired to prevent the leakage of the seal from causing trouble. 5, a tooth with acute periapical inflammation, surrounding teeth are involved in pain is not good to determine which tooth, do not use the buckle check, it is best to use pressure check more accurate. 6, full denture first wear, may be because the edge is too long and dislocated when the patient speaks, open mouth, then you can wear the denture, by pulling the patient’s mouth lip outward, if pull a certain place appears denture loose, then this is the location of the edge long. 7, mixing plaster powder, if you want to make it solidify faster so as to quickly remove the touch, you can use warm saline instead of water, while mixing faster, you can also directly put a small amount of salt in the plaster. 8, encounter the need to give the mouth on the corrosive drugs, you can first blow dry the treatment area near the mucosa, and then cut the appropriate cling film attached to the mucosa and the gum end of the film into the gum sulcus, can better protect the mucosa from damage. 9, for some clinics, in order to protect the cleanliness of the treatment table, you can smother a layer of cling film and change it once a day. 10, denture trial wear with occlusal paper check, think there is no longer a high point, why patients feel high or in a few months and then bite pain, in fact, the early contact point of occlusion, is in the neighboring teeth, because the restoration force in place, and push the neighboring teeth, the neighboring teeth shift to form early contact point. 11, when doing temporary crowns, on the prepared tooth or model (model can generally use wax) paste a layer of cling film, and then on the self-clotting, temporary crowns will be easy to take off, and very smooth. 12, when doing temporary crowns before not hard can be taken down and trimmed with scissors and then put on, and then take down, can save a lot of grinding time. 13, the posterior area of the tooth to do the root canal when doing machine expansion preparation, mounted on the needle can not be put into the mouth, you can first put the needle into the root canal by hand and then put the needle in the mouth, in addition to reduce the height of the treated tooth is also a way (because later are to crown repair). 14.Cut the ligature rubber chain with wire cutting pliers and be careful not to cut the patient’s mucosa. The fastest way to remove the wire head on the end cutting pliers is to clip it on a wet cotton ball. 15.A good way to remove the dirt on the pulp extraction needle is to tie it on the prescription stick several times. 16, sticky brackets, the above 45 to observe the accuracy of the position with a stomatoscope, the lower anterior region of the vestibular groove to be separated by a tampon to not sticky posterior brackets when the incisor touches the mucosa contaminated by saliva still do not know.