Why freezing at dentist does not work?

Freezing at the dentist, often referred to as local anesthesia, may not work effectively for several reasons. Individual variations in anatomy and physiology can affect how well anesthetics are absorbed and distributed. Additionally, anxiety or pain can heighten sensitivity, making it seem like the anesthesia isn't working. Other factors, such as infection or inflammation in the area, can also diminish the effectiveness of the anesthetic.