Pain is the main cause that cancels the visit to the dentist. But sooner or later this pain becomes unbearable. First of all let’s discuss modern methods of anesthetic means. Today the most modern and common anesthetic means are considered to be those with the base of Arthicain like ultracain, septhanest, ubisthesin and alfacain. These anesthetics influence for almost 6 hours. This process is held thanks to the presence of vasoconstrictor in the anesthetic. This kind of medicine usually has the sign FORTE (strong) on it. With the presence of Adrenalin in this medicine is explained the faster heart beating and the troubled feeling of the visitor after the injection. Ask your dentist what kind of anesthetic he/she uses. In any case inform about the presence or absence of the allergy on this or that medicine. The dentist can pass a scarification test on allergy just on spot. They do some scratches on the arm and fall some drops of the medicine on it, after which they check the reaction of the body. It is also possible that they send you to a more detailed examination to the centre of allergology.