Custom vs Boil-and-Bite Mouthguards: What Twelve Seasons Taught Me

There are two mouthguards in the side pocket of my gear bag. One cost about eight euros and I shaped it in a camping pot on a beach in Zeeland in 2016. The other came out of a lab, moulded off my own teeth, and cost roughly twenty-five times as much. I have worn both for hundreds of hours. For a long time I assumed they were the same product at two price points. They are not.

Before I go further: I am not a dentist. I taught kite and wakeboard for twelve seasons and I have had one of my own front teeth rebuilt, which makes me experienced, not qualified. Everything below is what I picked up from being on the wrong end of an accident and asking a lot of questions afterwards.

What the cheap one actually does

You drop it in near-boiling water for half a minute, press it up onto your top teeth, suck hard, and hold while it sets. The plastic takes a rough print of your arch. That print is real, and a well-fitted boil-and-bite guard is far better than nothing. It puts a few millimetres of soft material between a steel handle and your incisors, and on a good day that turns a broken tooth into a split lip.

The problem shows up over the next fifty sessions. You form it by biting into it, which means you thin the material exactly where you bite hardest, over the front teeth and the first molars. That is the same place you want it thickest. Mine started somewhere around four millimetres and had maybe half of that over the left molars by the end of a summer. It also loosens as it warms and cools. A guard you have to clench to hold in place is a guard that leaves your mouth the second you speak, and I spoke constantly, because I was coaching.

What custom actually buys you

A custom guard starts from an impression or a scan, and the material is pressure-formed onto a model of your actual mouth. Two things change. Thickness becomes a decision instead of an accident, so the material stays deep over the areas that get hit. And the thing stays put without any effort from you.

Retention is the part I underrated for years. A guard you keep in for a full three-hour session protects you for three hours. The finest material on earth does nothing sitting on the dashboard of the boat, and that is where the cheap ones spend a lot of their lives. Ask any instructor. Everyone has a story about the guard that lived in a pocket.

The American Dental Association summary of guard types is careful about ranking them, and I understand why: fit and consistent use matter more than the category on the packet. But if you are on the water four days a week for a season, the arithmetic gets simple. A lab guard is one dinner out per month across a year. My chipped incisor cost more than that in the first appointment alone, before anyone had done anything except look at it.

The trade-offs nobody mentions

Custom guards are not perfect. Mine took ten days to arrive and I trained without one in the meantime, which was stupid, and I got away with it. They do not fit forever either. If you have any dental work done, or you are under about eighteen and still growing, the fit drifts, and I have written separately about how dental work quietly cancels out your old guard. They are also easy to lose, because you take them out to eat and put them on a table.

Boil-and-bite has a genuine advantage too, and it is not only price. You can reshape it. If you are travelling, if you lose one in a car park at a competition, if a beginner turns up with nothing, you can produce a workable guard in about six minutes with a kettle. I keep two spares in the van for exactly that reason and I do not feel bad about it.

The fit test I use now

This is the checklist I run on students, and on myself about once a month:

• It stays up when you open wide, tip your head forward, and say a full sentence without holding it there with your tongue.
• You can breathe hard through your mouth without it rattling or catching.
• It covers the back molars properly, not just the front six teeth.
• There is no thin, shiny, see-through patch where you have chewed through it.
• It does not press hard on the gum anywhere, especially behind the front teeth.

Fail two of those and it is scrap. Guards are cheap compared with teeth, and I have never once regretted binning one early.

What I would tell my younger self

Wear it on the boring sessions. Almost nobody gets hurt on the day they were nervous. I got hit on a flat, grey Tuesday evening at a cable park doing something I had done ten thousand times, with the guard sitting in the car. A bad edge, the line went slack and loaded, and the handle caught my top left front tooth. The chip was tiny. The nerve died anyway, quietly, about eighteen months later, and I ended up with root canal treatment and a crown for something that took a quarter of a second.

Second thing: a guard protects teeth. It is not armour for your jaw and it is not a concussion device, whatever the packaging suggests. After my own scare I read a lot about what happens to the jaw after a hit, and the honest answer is that a guard is one layer, not a shield.

And if a tooth does come out completely, the clock starts the instant it lands. That is worth knowing before you need it rather than after, which is why the first thirty minutes is the piece I would read first if I were starting over.