Xylocaine strength used in dentistry is

**Core Concept**
Local anesthetics like Xylocaine are used in dentistry to block nerve impulses, preventing pain during dental procedures. The concentration of the local anesthetic is crucial in achieving effective anesthesia while minimizing toxicity.

**Why the Correct Answer is Right**
Xylocaine, a local anesthetic, is commonly used in dentistry. The concentration of Xylocaine used in dentistry is typically 2% (20mg/mL) with a vasoconstrictor like epinephrine. This concentration provides effective anesthesia for most dental procedures. The addition of epinephrine helps to prolong the duration of anesthesia by causing vasoconstriction, which reduces the systemic absorption of the local anesthetic.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the concentration of Xylocaine used in dentistry.
* **Option B:** This option is incorrect because it is not a standard concentration of Xylocaine used in dentistry.
* **Option D:** This option is incorrect because it does not specify the addition of a vasoconstrictor like epinephrine, which is necessary for effective anesthesia.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the concentration of local anesthetics can vary depending on the procedure and patient factors. Always check the label and consult with a medical professional before administering local anesthesia.

**Correct Answer: C. 2% with epinephrine**