Could be an abscess from an infected tooth, an infected salivary gland, or the result of being struck in the right lower jaw among many other things. More information is required to be precise.
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It sounds like an abscess has developed in your gums. Your doctor would probably put you on a course of penicillin. If you don't want to go to your doctor, try anti-inflammatory painkillers - ask your local chemist/pharmacy for advice.
Submandibular is the medical term meaning under the lower jaw.
The muscles in your jaw are called the masseter muscles. These muscles are responsible for closing the jaw by raising the lower mandible.
The lower part of the tooth that fits into a socket in the jaw is called the root.
Anatomically called the mental protuberance
Anterior guidance is the contact between the upper and lower front teeth that guides the movement of the lower jaw during activities like chewing and speaking. It helps maintain the stability and coordination of the jaw joints and muscles during function. Imbalances in anterior guidance can lead to issues like jaw pain or difficulty with jaw movements.