bruxo-, brux- +

(Greek: grinding or gnashing the teeth; rubbing the teeth together)

The habitual, involuntary grinding or clenching of the teeth, usually during sleep, as from anger, tension, fear, or frustration.
Anyone who habitually and involuntarily grinds his or her teeth.

Many bruxers grind their teeth excessively, often through stress or nervous tension, usually while they are asleep so they usually are not aware that they are doing it. The result of such activities wear away tooth enamel, can cause cracks in the teeth, and often leads to sore and tired facial and jaw muscles.

bruxing appliance or "night guard"
A plastic guard which is usually placed over the lower teeth so the upper and lower teeth will not grind against each other and so it prevents bruxism.
1. Involuntarily or unconsciously clenching or grinding the teeth, typically during sleep.
2. The unconscious habit of grinding or gritting the teeth that occurs during sleep or in stressful situations and can lead to excessive wear of the teeth.
3. Bruxism is due to clenching of the teeth other than in chewing and is associated with forceful lateral or protrusive jaw movements. This results in the grinding or rubbing of the teeth together.

Bruxism usually occurs during sleep

Bruxers involuntarily gnash their teeth either during sleep, or unconsciously during waking hours. This stressful grinding of th teeth exerts thousands of pounds of pressure on the teeth surfaces and can severely damage the teeth, the gums, and the jawbones.

During bruxism episodes, there is no food to cushion the blows of the teeth colliding against each other. Bruxism, therefore, can upset the delicate pressure balance of teeth, wearing down the ridges of tooth enamel and loosening or moving teeth from their proper positions.

All of this grinding and clenching of teeth can cause facial muscles to ache or tighten up with sharp pain. This can lead to pain and clicking or cracking sounds in the joints of the jawbones and a severe headache.

Gum diseases may be aggravated by bruxism to the extent that the bone supporting the teeth is lost and they become loosened and fall out.

It is sometimes done to such an excess that it damages the occlusal surfaces of the teeth, particularly the molar teeth, and may contribute to the temporomandibular joint (TMJ) syndrome.

The temporomandibular joint (TMJ) is the area directly in front of the ear on either side of the head where the upper jaw (maxilla) and lower jaw (mandible) meet.

Within the TMJ there are moving parts that allow the upper jaw to close on the lower jaw. This joint is a typical sliding "ball and socket" which has a disc sandwiched between it.

The TMJ is used many hundreds of times a day in moving the jaw, biting and chewing, talking and yawning. It is one of the most frequently used of all the joints in the body.

The temporomandibular joints are complex and are composed of muscles, tendons, and bones. Each component contributes to the smooth operation of the TMJ.

When the muscles are relaxed and balanced and both jaw joints open and close comfortably, we are able to talk, chew, or yawn without pain.

—Based primarily on information from
"Gnash, Grind, Chomp" by Neil McAleer in The Body Almanac;
Doubleday & Company, Inc., Garden City, New York; 1985, pages 175-176.
Bruxism is a leading cause of wealthy orthodontists.
bruxomania (s) (noun), bruxomanias (pl)
1. A gnashing, grinding, gritting, and clenching of the teeth in other than normal chewing movements occurring unconsciously in the daytime; sometimes resulting in a loosening of the teeth and a bleeding of the gums.
2. Compulsive and continual crushing of the teeth together, with intermittent grinding.
3. The involuntary, "nervous" grinding of the teeth while a patient is awake.

It is thought bruxomania occurs as a way to relieve tension or stress and was first diagnosed as a medical condition in 1907.

bruxomaniac (noun), bruxomaniacs (pl)
Someone who has a compulsive, and uncontrollable and continual crushing of the teeth together, with intermittent grinding.
bruxophobia (s) (noun), bruxophobias (pl)
An abnormal aversion of grinding the teeth together because of the damage or pain which excessive teeth grinding or jaw clenching might cause: Bruxophobia occurs when someone is afraid that he or she could have oral health complications brought on by dentition grating, therefore causing impairment, injury, or other oral health complications.

Because pressing the two jawbones together often occurs during sleep, most people are unaware that they grate their teeth, however a dull, constant headache or sore jaw when someone wakes up is a revealing symptom which can cause bruxophobia.

Related "tooth, teeth" word units: dento-; odonto-.

Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": frica-, frict-; terg-; tribo-; -tripsy; trit-.