The split second the guard is designed for
Dental injuries in sport are rarely dramatic in the way people imagine. An elbow in a jump for the ball, a knee to the chin, a fall onto a handlebar, a sparring partner’s shoulder — the force is short, sharp, and usually arrives at the front of the mouth.
Three things then happen very fast.
The force concentrates. Upper front teeth stand ahead of everything else and take the hit alone. Teeth are hard but brittle: excellent under the vertical pressure of chewing, far less tolerant of a sideways blow.
The lip is caught in between. Much of the bleeding after a sports impact comes not from the teeth but from the lip being driven onto their edges — or onto the brackets of a fixed brace.
The jaws slam together. A blow to the chin snaps the lower jaw up against the upper. That is how back teeth crack and how the jaw joint (Kiefergelenk) takes load it was never built for.
A properly fitting guard interferes with all three: it cushions and distributes the impact, it puts a layer between lip and tooth edges, and it stops the two rows of teeth meeting hard.
What it realistically protects
- Broken and chipped front teeth — the most common sports injury to teeth by a wide margin.
- Knocked-out (avulsed) teeth — the injury with the longest consequences.
- Cut lips, cheeks and tongue, particularly with braces.
- Cracked back teeth from the jaws being forced together.
- Existing dental work — crowns, veneers and implant crowns do not tolerate impacts any better than natural teeth, and in some cases worse.
What it does not do — stated plainly
This is where honest advice separates from marketing.
It does not prevent concussion. The idea is intuitive and popular, and the research does not support a clear protective effect. Wear a mouthguard for your teeth and your jaw; wear the head protection your sport prescribes for your head.
It does not protect what it does not cover. Standard guards cover the upper teeth. In sports where the blow comes from below — combat sports above all — the lower jaw stays exposed unless a design covering it is specifically discussed.
It does not work in your bag. The single biggest cause of failure is not wearing it, usually because it is uncomfortable, and usually because it does not fit.
It does not replace a helmet, a face cage or a gum shield rule. It is one piece of protective equipment, not a substitute for the rest.
It does not make a fragile tooth strong. A tooth already weakened by a large filling or a root canal treatment (Wurzelbehandlung) remains the weak point. That is an argument for wearing a guard, not against it.
"I've played for ten years and nothing has happened"
It is the most common objection, and it is not a stupid one — most amateur players do go a whole career without losing a tooth.
The issue is the shape of the risk rather than its size: low probability per session, very high cost if it happens, and the damage falls almost always on a healthy, untouched front tooth. You are not risking a filling. You are risking one of the eight teeth people see when you speak. There is a survivorship effect here too — the people who tell you a guard is unnecessary are, by definition, the ones it did not happen to.
The long tail of one broken front tooth
Ask a dentist why they wear a guard themselves and the answer is usually not the accident — it is what follows it.
A small chip is a filling, repeated every few years as the material ages. A larger fracture may need a crown (Krone), and a crown placed at 25 is not the last crown of that person’s life. If the nerve dies — sometimes years after the impact — root canal treatment follows, and a root-treated front tooth is more brittle than it was. If the tooth is lost, the options are an implant (Implantat), a bridge (Brücke) that requires grinding down the healthy neighbours, or a removable denture (Prothese).
And that is where the German system produces a surprise for most international patients. Statutory health insurance does not pay the whole cost of replacing a front tooth; it pays a fixed subsidy (Festzuschuss) towards standard care (Regelversorgung). For a single missing tooth in 2026 that subsidy is 552.96 € with no bonus stamps, 645.12 € with a bonus booklet (Bonusheft) kept up for five years, 691.20 € after ten years, and up to 921.60 € under the hardship provision (Härtefallregelung). Anything above the standard option — and for a visible front tooth, most people want something above the standard option — is your own money. As a general market range in Germany, not our prices, an implant with a crown is commonly quoted at around 2,100–4,000 €.
Set against that, protective equipment for the mouth is one of the cheaper decisions in sport. What it costs and why the price varies is covered in What does a sports mouthguard cost?.
Where the case is strongest
In boxing, martial arts, ice hockey, field hockey, rugby, American football and lacrosse, a mouthguard is either compulsory or so standard that nobody argues about it.
The interesting group is the sports where nothing is required and injuries still happen: football and handball above all, plus basketball, and everything with wheels — mountain biking, BMX, skateboarding, inline skating. Amateur football in and around Wuppertal fills more dental appointments than any other single activity we see, and almost none of those players were wearing a guard. Sport by sport, the picture is in Which sports need a mouthguard?.
Adults returning to sport in their thirties and forties are their own category: the reflexes have changed, the dental work has accumulated, and a crowned or veneered front tooth is expensive to lose twice. What an individually fitted guard involves for each of these sports is set out on Sports mouthguards – service page (EN).
Getting used to it — and when to have it looked at
Get seen promptly after an impact if a tooth hurts on biting, feels loose or “too high”, if a piece has broken off, if bleeding will not stop, or if your bite suddenly feels different. A tooth that darkens weeks or months later also needs checking — nerves sometimes die quietly. If your child is the one playing, the first-aid steps for a knocked-out tooth are set out in Sports mouthguards for children.
Special situations
If you grind your teeth, do not use your night guard (Knirscherschiene) for sport or your sports guard at night. They are made from different materials for different forces, and neither does the other job well.
If you have fixed braces, the guard has to be designed around the brackets, and the risk of lip injury without one is higher, not lower.
If you have asthma or breathe through your mouth in hard training, say so — the design can take that into account, and a bulky ready-made guard is usually the wrong answer.
If you are new to Germany, two things are worth knowing. Nobody will hand you a mouthguard at a Verein: you organise it yourself through a dental practice. And you do not need a referral (Überweisung) to book. If discussing sports injuries and dental terminology in German feels like one hurdle too many, it need not be — we work in English every day, alongside German, Russian, Turkish, Ukrainian, Arabic, Kurdish and French: English-Speaking Dentist in NRW.
You can, and it is better than nothing. Ready-made and boil-and-bite guards fit approximately, tend to be bulkier, and thin out exactly where you bite hardest. Most people who switch to a laboratory-made guard say the difference is in how little they notice it — which is also what makes them wear it.
For both. Injuries in training are at least as common as injuries in competition, and a guard that only comes out on match days never becomes a habit.
A well-fitting custom guard has a modest effect on speech at first and little on breathing. Bulky ready-made models are a different story, and that is usually what people remember when they say they cannot wear one.
Not in the statutory system — a sports mouthguard is a private service. Some private insurers and supplementary dental policies (Zahnzusatzversicherung) treat it differently, so it is worth a direct question to your insurer before you assume either way.
It reduces the load on them, which is the reason to wear one if you have invested in that work. It does not make them impact-proof, and a crown or veneer can chip under a direct blow like a natural tooth.
A mouthguard is not about fear and it is not a talisman. It is a piece of equipment that changes how force behaves in the moment of impact: distributed instead of concentrated, absorbed instead of transmitted. It will not prevent every injury, it does nothing for concussion, and it only works if it fits well enough to be worn without thinking about it. The reason to bother is that the injury it is designed to prevent is the one with the longest and most expensive aftermath — and, unlike most sporting risks, it is the one you can do something about before you step onto the pitch.
Zahnarztpraxis Tsypin · Wuppertal. This article was medically reviewed and is provided for information; it does not replace an examination. Updated August 2026.
