If you've noticed deep bite marks, cracks, thinning material, or even holes in your night guard, you're probably wondering: "Why am I wearing through my night guard so quickly?"
The good news is that wear on a night guard often means it's doing exactly what it was designed to do—protect your teeth from the damaging effects of grinding and clenching. However, excessive wear can also signal that your grinding habits are more severe than you realize.
Let's take a closer look at why night guards wear out and what you can do about it.
Prefer to watch instead? Check out our video below, where we explain the most common reasons people wear through their night guards and what it may mean for your oral health.
1. You Have Severe Teeth Grinding (Bruxism)
The most common reason people wear through a night guard is heavy teeth grinding, also known as bruxism.
Many people are surprised to learn how much force their jaw muscles can generate while they sleep. During episodes of grinding or clenching, your teeth may exert hundreds of pounds of pressure. Rather than allowing that force to damage your natural teeth, your night guard absorbs the impact.
Over time, this repeated stress can leave visible wear marks, grooves, or flattened areas on the guard.
In many cases, these marks are evidence that your night guard is successfully protecting your teeth.
2. You're Clenching More Than You Realize
Not all bruxism involves side-to-side grinding.
Many people primarily clench their teeth together for extended periods during sleep. While clenching may not always leave obvious scratch marks, it can place tremendous pressure on a night guard.
This constant force can cause the material to compress, thin out, or eventually crack.
Stress, anxiety, intense concentration during the day, and poor sleep quality are common contributors to nighttime clenching.
3. Your Night Guard Material Isn't Designed for Heavy Grinding
Different night guards are made from different materials.
Soft night guards are often comfortable and flexible, but they generally wear faster under heavy grinding forces.
If you're unsure which material is best for your grinding habits, understanding the differences between soft and hard night guards can help you make a more informed decision.
For mild grinders, a soft guard may provide years of service. For aggressive grinders, however, a soft guard may show significant wear much sooner.
For individuals who grind aggressively, a custom hard night guard may provide greater durability and longer-lasting protection than a softer material.
Patients who consistently wear through traditional night guards may benefit from a more durable appliance specifically designed for heavy bruxism.
4. Stress Levels Have Increased
Many people notice increased night guard wear during periods of high stress.
Major life events, demanding work schedules, financial concerns, and emotional stress can all contribute to increased grinding and clenching.
If your night guard suddenly seems to be wearing out faster than usual, consider whether stress levels have changed recently.
Your mouth may be responding to stress even if you're not consciously aware of it.
5. Certain Medications and Health Conditions Can Contribute
Some medications have been associated with increased teeth grinding.
Certain antidepressants, stimulant medications, and sleep-related disorders may contribute to nighttime bruxism in some individuals.
Sleep disorders such as obstructive sleep apnea have also been linked to increased grinding activity.
If you notice sudden changes in your grinding habits, it may be worth discussing the issue with your physician or dentist.
6. Your Night Guard Is Simply Reaching the End of Its Life
Like tires on a car, night guards eventually wear out.
The lifespan of a night guard depends on several factors, including:
- The severity of your grinding
- The material used
- How often you wear it
- How well it is maintained
Some people may use the same guard for several years, while heavy grinders may need replacement more frequently.
Signs that it's time for a replacement include:
- Holes in the material
- Cracks or fractures
- Significant thinning
- Sharp edges
- Reduced comfort or retention
- Changes in fit
When Should You Replace a Worn Night Guard?
A night guard should be replaced when it can no longer adequately protect your teeth.
If you notice severe wear, holes, or structural damage, continuing to wear the appliance may reduce its ability to absorb grinding forces effectively.
If your guard feels loose, shifts during sleep, or no longer fits as securely as it once did, it may be time to evaluate both its condition and fit.
Replacing a worn guard can help ensure your teeth remain protected from unnecessary wear, fractures, and sensitivity.
Not sure whether your appliance has reached the end of its lifespan? Learn the most common signs you need a new night guard.
The Bottom Line
If you're wearing through your night guard, it's usually a sign that the appliance is taking the damage instead of your teeth.
While some wear is completely normal, excessive wear may indicate severe grinding, increased clenching, elevated stress levels, or the need for a more durable night guard material.
Monitoring your guard for signs of damage and replacing it when necessary can help keep your smile protected for years to come.