The harms of one-sided chewing | 医療法人社団EPSDC

Tokyo International Dentall Clinic Roppongi near Azabu-juban station explains the problem of unilateral biting habit.

Unilateral bite

1. Introduction: An unexpected habit that shapes your “meal satisfaction”

“Food that should taste great somehow feels underwhelming.” “I don’t feel like I’m really chewing well.” The vague discomfort behind these feelings may, in fact, come from an unconscious “chewing habit” we repeat every day.

In modern dentistry, not only mechanical bite issues but also patients’ own “behavioral habits” are recognized as key factors. This article explains the results of a large-scale study by Ciotola and colleagues (2026), led by the University of Trieste, Italy. Surveying 1,425 adults and using the standard assessment tool OBC-21 (Oral Behaviours Checklist), the researchers showed how strongly our everyday habits are tied to meal satisfaction.

2. Point 1: Is unconscious “unilateral chewing” robbing you of the joy of eating?

Unilateral chewing—relying predominantly on one side during meals—showed a statistically significant negative association with self-reported “mastication satisfaction.”

Importantly, the effect was graded: as the frequency of one-sided chewing increased, satisfaction decreased proportionally. The team summarized this with the conclusion:

“Limited mastication satisfaction was associated with frequent unilateral chewing.”

In other words, an imbalanced left-right chewing pattern lowers the quality of your eating experience—whether you realize it or not.

3. Point 2: By the numbers—“Always one side” cuts satisfaction by about 80%

The most striking figure was the magnitude of decline when one-sided chewing had become habitual. Those who answered “I always chew on one side” had an odds ratio (OR) of 0.17 for mastication satisfaction compared with those who chewed bilaterally in balance.

Converted to probability, people who “always chew on one side” were about 82.6% less likely to feel satisfied than those who chew on both sides.

Why such a large gap? Habitual chewing can turn into a “non-goal-directed habit.” When you keep chewing mechanically on one side, the sensory input—textures and flavors that should be perceived across the entire mouth—gets restricted, as if the sensory channels were muted. As a result, even fine cuisine cannot be fully appreciated.

4. Point 3: The surprising roles of “sex” and “mind” in satisfaction

Beyond chewing habits, mastication satisfaction is also closely linked to sex and psychological factors.

– Sex differences (OR = 0.69): Women were more likely than men to report lower chewing satisfaction, potentially reflecting differences in bite force and related factors.

– Somatization (OR = 0.91): Individuals with stronger tendencies to express stress as bodily discomfort reported lower satisfaction. The more sensitive one is to bodily sensations, the more likely functional asymmetry is perceived as dissatisfaction.

– Depression (OR = 1.04): Interestingly, slightly higher depression scores were associated with marginally higher satisfaction. Given the sample’s overall good health and low absolute scores, this is likely a context-specific finding, underscoring the complex interplay between mental state and chewing satisfaction.

5. Point 4: What you can do today—self-managing how you chew

How can you reclaim lost satisfaction? The study highlights the effectiveness of self-regulation and mindful eating.

To break the automated loop of unilateral chewing, “initial awareness” is essential. A clinically promising approach is EMA/EMI (Ecological Momentary Assessment/Intervention): real-time self-monitoring of “how am I chewing right now?” in daily life, with intentional behavior adjustments.

With a dental specialist’s guidance—learning to notice and reset your own habits—unconscious chewing patterns can improve. Deliberately alternating left and right with each bite may be a simple yet powerful self-regulation that boosts chewing performance.

6. Conclusion: Shift your “awareness” bite by bite, and meals become more enjoyable

Bite complaints are not always structural issues like tooth alignment or mechanics. Far more often, accumulated unconscious habits quietly erode the joy of eating.

Meals should restore body and mind and enrich life. What determines that satisfaction may not be special ingredients or luxury restaurants, but the awareness you bring to your very first bite.

Which teeth did you use for your first bite today? At your next meal, widen your awareness left and right and savor the joy of chewing with your whole mouth.

Reference

Ciotola, C., Hmeidan, M., Contardo, L., & Reda, B. (2026). Unilateral Chewing Frequency and Self‐Reported Mastication Satisfaction: A Cross‐Sectional Study. Journal of Oral Rehabilitation.

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