What Causes Teeth Grinding in Babies?

Bruxism—commonly known as teeth grinding or clenching—is a well-documented phenomenon in infants and young children. While occasional grinding during sleep is frequently observed in toddlers and preschoolers, it is generally considered a benign, self-limiting behavior rather than a sign of underlying pathology.

Physiological bruxism in early childhood often coincides with key developmental milestones, particularly the eruption of primary teeth. The neuromuscular activity associated with teething—including jaw clenching and rhythmic grinding—may serve as a natural response to oral discomfort or as part of sensorimotor exploration. Additionally, immature regulation of the central nervous system during sleep transitions (especially between non-REM and REM stages) can contribute to transient, involuntary jaw movements.

Unlike adult bruxism, which may be linked to stress, anxiety, or occlusal factors, pediatric bruxism rarely correlates with psychological distress or dental malocclusion in otherwise healthy children. Most cases resolve spontaneously by age 6–7 years, typically as permanent dentition emerges and neural control matures.

Clinicians advise parental reassurance over intervention in asymptomatic cases. However, evaluation is warranted if grinding is accompanied by audible noise disrupting sleep, visible tooth wear, jaw pain, headaches, or signs of temporomandibular joint dysfunction. In such instances, a comprehensive assessment—including dental examination, sleep history, and behavioral screening—helps rule out secondary causes such as sleep-disordered breathing, gastroesophageal reflux, or neurodevelopmental conditions.

Routine use of occlusal guards or pharmacologic agents is not recommended for young children due to safety concerns, lack of evidence, and potential interference with normal craniofacial development. Instead, supportive strategies—such as maintaining consistent bedtime routines, addressing nasal congestion or airway obstruction, and ensuring adequate hydration and micronutrient status (e.g., iron, magnesium)—may support overall sleep quality and neuromuscular regulation.