Is a shop-bought night guard as good as a custom one?

Not usually. A shop-bought or boil-and-bite guard is a generic shape softened and bitten into at home, so the fit is approximate at best. A custom night guard is made from a scan or impression of your own teeth, so it seats accurately, stays in place overnight, and protects evenly.

Why does the fit of a night guard matter so much?

A loose or uneven guard shifts while you sleep, can concentrate grinding forces on a few teeth rather than spreading them evenly, and is uncomfortable enough that many people stop wearing it. Fit is what determines whether a guard actually protects — and whether you'll keep using it.

Can a boil-and-bite guard damage your teeth?

A poorly fitting guard doesn't necessarily damage teeth on its own, but it can shift your bite, feel uncomfortable, and — because it's one-size-fits-all — often can't provide the even contact that protects against grinding forces properly. If it doesn't fit well, it isn't doing its job.

How does my dentist choose the right night guard for me?

It depends on how you grind and clench. Mild cases often suit a soft guard; moderate to severe grinding usually needs a hard or dual-laminate design that resists wear. See our guide to hard vs soft night guards for how that decision is made.

Is it worth switching to a custom night guard?

For most people who grind or clench regularly, yes — a custom guard fits accurately, is made in a material suited to how hard you grind, and is comfortable enough to actually wear every night. A guard only protects if it's worn, and a well-fitting custom guard is far more likely to be.

Can I get a custom night guard without visiting a dentist?

No — a night guard needs a dental scan or impression and is prescribed by a dentist, who checks your bite and chooses the right design. As a lab, we make night guards to a dentist's prescription.

Custom Night Guard vs Shop-Bought: Which Do You Need?

By Bridge Dental Laboratory · 11 August 2026

If you grind or clench your teeth, it’s tempting to pick up an off-the-shelf guard from a pharmacy or sports shop rather than go through a dentist. It’s quick, and on the shelf it looks much like a proper night guard. The difference only becomes obvious once you actually wear one — and it comes down to fit.

What a shop-bought guard actually is

Pharmacy and boil-and-bite guards are a generic, one-size-fits-all shape. With a boil-and-bite, you soften it in hot water and bite down to get a rough impression of your teeth. It’s a reasonable idea, but the result is never as accurate as a guard made from an actual scan or impression of your mouth — the material is thick, the fit is approximate, and it’s the same shape for everyone regardless of the size or shape of your arch.

What a custom night guard is

A custom night guard is made from a scan or impression of your own teeth, taken by your dentist. That means the lab building it knows exactly the shape of your arch, so the guard seats accurately, stays put overnight, and can be made in the material and thickness suited to how hard you grind — soft for milder cases, hard or dual-laminate for heavier grinders. See our guide to hard vs soft night guards for how that choice is made.

Why the fit is what actually matters

A night guard only does its job if it:

Stays in place while you sleep, rather than shifting or being pushed out
Spreads grinding and clenching forces evenly across the arch, rather than concentrating them on a few teeth
Is comfortable enough that you actually wear it — a guard left in a drawer protects nobody

A loose, bulky, one-size-fits-all guard struggles on all three counts. It can move overnight, feel awkward enough that people stop wearing it, and — because it isn’t shaped to your bite — may not distribute grinding forces the way a properly fitted guard does.

Comfort and durability

Beyond fit, a custom guard is made in a material matched to your case. A boil-and-bite is one thickness regardless of whether you clench lightly or grind heavily all night, so it either wears through quickly under heavy load or feels needlessly bulky for a mild case. A dentist-prescribed guard is chosen — soft, hard, or dual-laminate — to suit the grinding it actually needs to withstand.

The bottom line

A shop-bought guard is better than nothing for an occasional, mild grinder trying it out. But for anyone with a regular grinding or clenching habit, the value of a custom night guard is straightforward: an accurate fit, the right material for your case, and a guard comfortable enough to actually wear every night — which is, in the end, the only kind that protects.

Made to your dentist’s prescription

We make soft, hard and dual-laminate night guards to prescription in our Christchurch lab, each finished by hand by GDC-registered technicians. If you think you might be grinding or clenching, speak to your dentist — and for how to look after a guard once you have one, see our night guard cleaning and care guide.