Ace the NDEB 2026 – Get Set to Shine on Canada’s Dental Exam!

Para-amino benzoic acid is an ingredient found in certain local anesthetics and is a common allergen. Ester-type local anesthetics such as Procaine and Tetracaine contain para-amino benzoic acid and can cause an allergic reaction in those who are allergic. Amide-type local anesthetics such as Lidocaine and Bupivacaine do not contain this ingredient and are safe to use for those with an allergy to para-amino benzoic acid derivatives. Therefore, the correct answer is A because Ester-type local anesthetics cannot be used in case of an allergy to para-amino benzoic acid derivatives.