Should I get a custom night guard from the dentist or buy one at the store, and what is the real difference?

What the two kinds of guard have in common

Both a dentist-made guard and a store-bought guard do the same basic job: they put a layer of plastic between the upper and lower teeth so that, when you clench or grind in your sleep, the guard takes the wear instead of your enamel, fillings, crowns or veneers. Dentists call this type of appliance an occlusal guard or bite splint. It is designed to reduce the effects of grinding, not to stop the grinding itself, and that is true whichever kind you choose.

Neither kind is a treatment for the cause of bruxism. Grinding has been linked to stress and anxiety, sleep disorders, an abnormal bite, and missing or crooked teeth, and a guard does not change any of those. What a guard can do is protect the teeth and sometimes ease jaw-muscle soreness while the reasons for grinding are looked at separately.

What each kind actually is

Store-bought guards

• Stock guards come pre-formed in a few sizes and are worn as they are. They are the bulkiest and fit least closely.
• Boil-and-bite guards are softened in hot water and then pressed around the teeth. They follow the general shape of your teeth better than a stock guard, but the fit depends on how well you molded it, the material is usually soft, and nobody checks how the opposite teeth land on it.

Dentist-made guards

A custom guard starts with an examination, then a digital scan or an impression of your teeth and a record of how your jaws close. The guard is made on a model of your mouth, either in a laboratory or in the office, in a hard acrylic, a softer material or a dual-laminate with a soft inside and hard outside. At the fitting visit the dentist checks that it seats fully, that the opposite teeth touch it evenly, and that it does not press on any one tooth, then adjusts it. The ADA's patient guidance describes custom-fitted mouth protectors as providing the most comfort and protection of the three types, and notes that a dentist can make a nocturnal bite plate or bite splint specifically for people who grind at night.

Sports mouthguards are not night guards

A sports mouthguard is thick and soft to absorb impact during contact sports. It is not designed for hours of nightly clenching, and its thickness and softness are chosen for impact protection, not for steady grinding pressure. If you need both, they are two different appliances.

How the choices compare, point by point

• Fit and retention. A custom guard is made from a record of your own teeth, so it snaps into place and stays there. Store-bought guards fit more loosely, can shift during the night and may fall out or need to be held with the teeth.
• Bite check. This is the biggest practical difference. A custom guard is adjusted so that the opposing teeth meet it evenly. A store-bought guard is usually not checked by anyone, so a few teeth may carry most of the load, which can leave individual teeth sore or move the jaw into an unfamiliar position.
• Thickness and bulk. Custom guards are usually thinner because the material only needs to be where it is needed. Bulky guards are harder to sleep with, can trigger gagging and tend to end up on the nightstand.
• Durability. Hard custom materials usually resist being chewed through longer than the soft materials used in most boil-and-bite guards. Heavy grinders can wear through a soft guard quickly.
• Existing crowns, veneers, implants and bridges. If you have restorations, how a guard loads them matters. A systematic review suggests grinding may be a risk factor for mechanical complications on implant-supported restorations, such as chipped porcelain or loosened screws, though the evidence is limited, and veneers depend on the tooth underneath staying sound. A custom guard can be designed to spread the load away from these restorations; a store-bought guard cannot. See Are veneers permanent? What happens to your teeth underneath? for why the tooth under a veneer still needs protecting.
• Follow-up and adjustment. A custom guard comes with a dentist who can adjust it, check for wear and look for any new problems. With a store-bought guard, you are the only person checking.
• When it wears through or breaks. Ask the office how a worn or broken custom guard is handled and whether a scan is kept so a replacement can be made. A store-bought guard is simply replaced, which is cheap but means every replacement is another unchecked fit.
• Who notices new problems. Tooth movement, a bite that feels different in the morning, or new jaw-joint soreness are reasons to stop wearing any guard and have it checked. NIH guidance on jaw-joint disorders advises that oral appliances should not cause permanent changes in the bite, and that one causing or increasing pain should be stopped and reviewed.

What the research says

Evidence here is more modest than patients often expect. Systematic reviews of occlusal splints for bruxism find that splints can reduce the effects of grinding, such as tooth wear and muscle symptoms, but the studies are small and of varied quality, and no splint type has been shown to stop grinding. One small randomized trial of over-the-counter bite splints reported that participants wore them and that short-term measures of grinding impact improved. In other words, an inexpensive guard may help in the short term, a custom guard offers the closest fit and a built-in check, and neither is a cure.

The limitations both kinds share

• No guard stops the grinding itself. Clenching and grinding continue; the guard changes what they wear away.
• A poor fit can be worse than no guard. A guard that contacts only a few teeth, moves the jaw forward or encourages chewing can create new soreness or shift teeth over time. This risk is higher when nobody checks the fit.
• A guard does not treat an untreated tooth problem. Cracks, decay under old fillings and loose crowns need their own diagnosis. Covering a sore tooth with plastic can delay finding out why it hurts.
• A guard is not a sleep-breathing treatment. Loud snoring, gasping during sleep or daytime sleepiness alongside grinding should be raised with your dentist and physician, because some grinding is associated with disturbed sleep and a plain night guard does not address that.

What an examination changes

The right answer for you depends on what an examination finds. Your dentist will usually want to know how your teeth meet, whether there is visible wear or cracking, whether you have crowns, veneers, implants or a bridge that a guard will load, whether your jaw joints or muscles are tender, and whether anything needs treating before a guard is made so the guard is not built around a tooth that is about to change. The examination is also where a sleep-breathing concern, medications and stress come up, since those point toward causes rather than protection. Loul Dental Studio lists occlusal guards among its services; ask the office how its guards are made and what the fitting and adjustment visits involve.

Why a custom guard costs more, and what a quote should list

A custom guard usually costs more than a drugstore guard because you are paying for several steps rather than a piece of plastic: the examination, the scan or impression, fabrication in a laboratory or in the office, the fitting visit, and adjustments. This page does not list fees, because the right guard and the number of adjustments depend on the examination above. Ask for a written quote that shows each of those items separately, says what adjustments are included, and explains what happens if the guard needs remaking. Whether a dental plan covers an occlusal guard varies, so check with your plan directly. The guide How to Compare Dental Treatment Quotes Without Comparing Only Price explains how to line two quotes up item by item.

Questions to bring to the consultation

1. What kind of guard do you suggest for me, hard, soft or dual-laminate, and why?
2. Will it be designed around my crowns, veneers, implants or bridge?
3. Is anything in my mouth that should be treated before the guard is made?
4. Who checks my bite on the guard, and how many adjustments are included?
5. What signs mean I should stop wearing it and come back?
6. How is wear, breakage or a lost guard handled, and is my scan kept?

The next step

If you wake with sore jaw muscles, notice flattened or chipped edges on your teeth, or a partner hears you grinding, an examination is the place to start. You can send a request through the appointment request page; a request is not a confirmed appointment and the team will follow up to arrange a time. The office is open Monday to Thursday, 8:00 am to 5:00 pm, with select Fridays by appointment, and you can also call (805) 565-5111 during those hours. If you have pain with facial swelling, fever, difficulty swallowing or breathing, or uncontrolled bleeding, that is a medical emergency: call 911 or go to the nearest emergency department rather than waiting for a dental appointment.