Nighttime teeth grinding, medically known as sleep bruxism, is an involuntary clenching or rubbing of teeth together during sleep. The forces exerted during night grinding can be up to ten times greater than the pressure used for normal chewing, making it highly destructive over time.
Causes of Night Grinding
Sleep bruxism is generally classified as a sleep-related movement disorder originating in the central nervous system. Its primary triggers include:Psychological Stress and Anxiety: Elevated cortisol and psychological pressure significantly increase resting jaw muscle tone, serving as a primary trigger.Sleep Apnea and Airway Obstruction: When the airway partially collapses during sleep, the brain prompts the jaw to clench and slide forward to mechanically reopen the airway.Lifestyle Stimulants: Consuming alcohol, heavy nicotine, or excessive caffeine (especially close to bedtime) alters sleep cycles and elevates involuntary muscle activity.Medication Side Effects: Certain prescription drugs, particularly Selective Serotonin Reuptake Inhibitors (SSRIs) used for depression and anxiety, can cause or worsen bruxism.Bite Misalignment (Malocclusion): Structural abnormalities where the upper and lower teeth do not fit together smoothly can prompt involuntary grinding.
