The short answer
If you grind or clench at night, a guard does one job well: it puts a barrier between your upper and lower teeth so the force does not wear them down. It does not stop the grinding itself. A custom guard made by a dentist fits most closely; a store-bought guard may offer less protection; doing nothing lets wear, chips and jaw soreness build. Your dentist can check for wear and suggest what fits.
General information, not a diagnosis. Your dentist will examine your mouth before recommending treatment.
How you find out you grind
Most people who grind or clench their teeth (bruxism) do it during sleep and have no idea. The clue is usually indirect: a partner hears it, you wake with a sore jaw or a dull headache, your teeth feel sensitive for no obvious reason, or a dentist notices flattened edges, small chips or worn spots during a routine exam. The ADA notes that dentists often spot these signs before patients do.
Other signs the ADA and MedlinePlus list include jaw pain or tenderness, plugged or painful ears, neck pain, teeth that are sensitive to hot, cold or sweet, and muscle tenderness in the morning. The post on teeth grinding and night guards walks through the signs in more detail, so this guide focuses on the decision.
Why it happens is less settled than people assume. The ADA describes grinding as usually thought of as a symptom of stress, with sleep disorders and teeth that do not line up as other possible causes. MedlinePlus puts it more cautiously: the cause is debated, and daily stress may be the trigger for many people.
What grinding does over time
Enamel is hard, but it is not built to be ground against enamel for hours a night. MedlinePlus lists worn-down teeth, fractured teeth and receding gums among the results, along with jaw pain, headaches and ear pain, and notes that grinding can contribute to problems with the jaw joint (TMJ). Its outlook is blunt: bruxism is not dangerous, but it can cause permanent tooth damage.
Dental work is at risk too. The ADA lists teeth grinding and clenching among the reasons veneers may be a poor choice, and the practice's night guard page notes that grinding can undo cosmetic and restorative work. If you have crowns, veneers or bonding on front teeth, a guard is partly an insurance policy on that work.
Wear is slow and silent, which is the real problem with doing nothing. Flattened edges, exposed dentin and the sensitivity that follows do not reverse. The guide on why teeth are sensitive explains how worn enamel leads to that cold-water zing.
What a night guard does, and what it does not
A night guard is an appliance that fits over your upper or lower teeth while you sleep. MedlinePlus describes a splint as something that may help protect your teeth from the pressure of grinding, and NIDCR says oral appliances fit over the teeth, protect them, and may help with habits such as clenching. That is the job: a barrier that takes the wear instead of your enamel.
What a guard does not do is stop you from grinding. MedlinePlus notes that some people feel better only while wearing the splint and that it may work less well over time, and that it does not treat the cause. NIDCR adds that a well-made appliance does not change the teeth or the bite, and that if one is suggested you should make sure it is not designed to permanently change your bite. If it causes pain, stop using it and call your dentist.
Expect the guard to be part of a plan rather than the whole plan. The ADA recommends pairing it with stress management, and if poor sleep is suspected, a physician or dentist may suggest a sleep study. Sleep apnea is diagnosed by a physician, not by a dental exam; the practice's page on whether you have sleep apnea explains that boundary.
| Question | Custom night guard | Store-bought guard | Doing nothing |
|---|---|---|---|
| Fit | Made from a mold or scan of your teeth | One size or boil-and-bite; can feel bulky | No barrier between teeth |
| Protects teeth? | Yes, a barrier every night it is worn | Some; the ADA says it may offer less protection | No; wear, chips and cracks can build |
| Stops grinding? | No; it protects, it does not cure | No | No |
| Who checks it | Your dentist, at regular visits | Nobody, unless you bring it in | Wear is found at exams, after it has happened |
| Makes sense when | Grinding is confirmed, or there is dental work to protect | A stopgap until a custom guard is made | Only if your dentist finds no wear and no symptoms |
Custom guard vs. store-bought guard
The ADA's guidance is direct: a custom night guard made from a mold taken by your dentist fits most closely, and store-bought guards may offer less protection. A custom guard is made from an impression or scan of your teeth, so it sits closely, stays in place and is less bulky, which matters because a guard protects nothing if it ends up on the nightstand at 2 a.m.
Store-bought guards are usually one size or boil-and-bite. They can be a stopgap if you need something tonight, but they tend to be thicker, can shift or fall out, and nobody checks whether they are changing how your teeth meet. The practice's preventive care page notes that a poorly fitting guard can shift your bite or fall out during the night. If you use one, bring it to your next visit so your dentist can look at it.
A custom guard also gets checked. Your dentist looks at the fit and the wear pattern at regular visits, which doubles as a record of how hard you are grinding and whether the plan is working.
What helps alongside a guard
Because the guard protects rather than cures, the self-care steps from MedlinePlus and NIDCR are worth doing at the same time. None of them require a prescription:
- Reduce daily stress and learn a relaxation routine; the ADA notes that meditation, counseling, exercise and deep breathing have been shown to help when paired with a guard.
- Notice daytime clenching and relax your jaw; MedlinePlus says changing daytime habits may be enough to reduce nighttime grinding for some people.
- Avoid chewing gum and very hard or chewy foods such as nuts, hard candy and steak while your jaw is sore.
- Apply ice or damp heat to sore jaw muscles, and try gentle stretching.
- Get enough sleep and drink plenty of water.
- If a sleep problem is suspected, ask your physician about a sleep study.
When to be seen, and when the practice refers
Book a visit if you have any of the signs above, if a partner hears grinding, or if dental work keeps chipping. If your jaw clicks or pops without pain, NIDCR says that is common, considered normal and does not need treatment on its own. If there is pain, locking, trouble opening wide or trouble eating, MedlinePlus advises seeing a dentist right away, and seeing one for a full evaluation if self-care has not helped within several weeks.
The practice's TMJ dentist page covers how jaw pain is evaluated, and the post on TMJ and jaw pain explains when to call. NIDCR recommends conservative treatment first and advises against treatments that permanently change the jaw joints, teeth or bite, so expect a guard and self-care before anything else. A cracked tooth found during the exam may need a crown, and a jaw problem that does not respond to conservative care is referred to a physician or an orofacial pain clinic. The practice offers same-day appointments when possible.