Night guard vs occlusal splint: what's the difference?
Night guards and occlusal splints both protect your teeth, but they differ in fit, durability, and how your dentist may recommend them. Learn which option might suit your needs.
Medically reviewed by Dr. Jose, DDS — August 30, 2026
Why Both Terms Exist
You may hear “night guard” and “occlusal splint” used interchangeably, but they often refer to different appliances. The confusion is common because both protect your teeth during sleep and work on similar principles — they cushion your bite and separate your upper and lower teeth. However, how they’re made and how they fit can make a real difference in your comfort and how well they work.
Over-the-Counter Night Guards
These are the boil-and-bite guards you buy at a pharmacy or online. You heat them in hot water, then bite into the softened plastic to create a mold of your teeth.
Pros:
- Available immediately, no appointment needed
- Lower upfront cost
- Reasonable for people who grind occasionally or want to try before committing to custom
Cons:
- Fit is imprecise because you’re molding it yourself
- Tend to shift during the night, requiring you to re-adjust
- Wear out faster — often within 3–6 months of regular use
- May not account for your individual bite pattern or jaw alignment
Custom Occlusal Splints (Office-Made)
These are fabricated by your dentist or a lab partner using precise impressions of your teeth and bite. They’re typically made of harder, more durable materials and are designed specifically for your mouth.
Pros:
- Precise fit based on your individual tooth and jaw anatomy
- Stays in place throughout the night with minimal shifting
- More durable — often lasts several years
- Can be adjusted by your dentist if your bite changes
- May be recommended if you have TMJ concerns, significant tooth wear, or a complex bite
Cons:
- Requires a dental appointment for impressions and fitting
- Takes time to fabricate (usually 1–2 weeks)
- Higher initial investment than boil-and-bite
Why Your Dentist May Recommend One Over the Other
During an exam, your dentist looks at:
- How much tooth wear you have
- Your bite alignment and jaw-joint health
- Whether you grind heavily or occasionally
- Your comfort and budget priorities
If you have significant wear, bite problems, or jaw pain, a custom splint gives your dentist control over the fit and can be adjusted to support your specific needs. If you’re unsure whether grinding is a regular problem for you, your dentist may suggest starting with an over-the-counter guard and reassessing after a few weeks.
Materials and Durability
Over-the-counter guards are typically soft plastic, which is easy to mold but wears down quickly under grinding. Custom splints are often made from harder acrylic or other materials designed to withstand nightly pressure, so they hold up longer and maintain their protective properties.
Caring for Either Type
Regardless of which you choose:
- Clean it daily with a soft brush and lukewarm water
- Store it in a dry case to prevent warping or bacterial growth
- Avoid very hot water unless the manufacturer says it’s safe
- Have your dentist inspect it at regular checkups
Is a Custom Splint Worth It?
That depends on how often you grind, how much comfort and durability matter to you, and whether your dentist identifies underlying bite or jaw issues. If grinding is occasional and mild, an over-the-counter guard may be fine as a first step. If you grind heavily, have worn teeth, or experience jaw or facial pain, a custom splint often pays for itself through durability and the tailored support it provides.
How MediMouth Helps
If you’re not sure whether you grind your teeth or which guard is right for you, a MediMouth dentist can perform an exam, show you any signs of wear on your teeth, and explain your options in plain terms. They can also fit you for a custom appliance if that’s the best fit for your needs. Use our directory to find a dentist near you and schedule a consultation.
Frequently asked questions
Can I just buy a night guard online instead of seeing my dentist?
Over-the-counter night guards work for some people, but a dentist exam first helps rule out underlying problems — like bite misalignment or jaw-joint issues — that a custom appliance might address more effectively. Many people find a custom fit more comfortable and durable long-term.
How do I know if I'm grinding my teeth at night?
Common signs include jaw soreness in the morning, worn or flat tooth surfaces, or headaches upon waking. Only a dentist can confirm grinding by examining your teeth and taking a history. If you suspect it, schedule an exam before buying an over-the-counter guard.
Which type lasts longer?
Custom appliances made in a dental office typically last years with proper care, while over-the-counter boil-and-bite guards often wear out or lose fit within months. Your dentist can advise on replacement timelines during your visits.