Dental anesthesia is generally local anesthesia, local anesthesia drugs are usually added epinephrine, which may induce another heart attack, in addition, heart attack patients taking anticoagulant drugs for a long time, if bleeding occurs after local anesthesia, it is not conducive to hemostasis, as follows. 1. Epinephrine in local anesthetic: adding epinephrine in local anesthetic can prolong the time of local anesthesia and reduce the toxic reaction, but epinephrine can cause palpitations (rapid heartbeat, often accompanied by panic), headache, tremor, increased blood pressure, arrhythmia and other adverse reactions, which produces pain, nervousness, fear and so on, which can lead to reoccurring infarction. 2. Heart attack patients taking long-term anticoagulant drugs: the treatment of myocardial infarction more anticoagulant to prevent recurrence, if the local anesthesia operation process of injection needle puncture blood vessels caused by hematoma, is not conducive to hemostasis. Oral local anesthesia for heart attack patients may have other effects, it is recommended to go to the regular medical institutions to receive professional treatment.