Trismus, also known as "can't open mouth wide enough for dentist," is a condition that limits the ability to open the mouth. It can be caused by a variety of factors, including muscle spasms, temporomandibular joint (TMJ) disorders, and certain medical conditions.
Trismus can make it difficult to eat, speak, and perform oral hygiene tasks. It can also lead to pain and discomfort in the jaw and face. In some cases, trismus can be a sign of a more serious underlying medical condition, such as tetanus or a brain tumor.