Local anesthesia is made up of several components as the local anesthetic drug, i.e. ester or amide, vasoconstrictor, and antioxidant. In some people, any one or more components can cause systemic side effects and allergies, though rare.
Local Anesthesia in dentistry is common and various dentists use it for many procedures on a daily basis. Lignocaine or Lidocaine is the most commonly used Local anesthetic agent. Use of local anesthesia is mandatory for dental procedures like root canal therapy and tooth extraction.