The short version
- World Rugby's own laws do not make a mouth guard compulsory. Law 4.2 recommends one, and Law 4.3(f) lists it among the items a player may wear in addition to standard kit.
- England Hockey strongly recommends shin, ankle and mouth protection across all ages and playing formats, and stops short of making any of it mandatory.
- Where a gum shield is compulsory, the rule comes from a club, a school or a league. The sport's laws do not make it compulsory. Read the rule that applies to you before you buy.
- A boil-and-bite guard off a shop shelf is a Class I medical device, and its own manufacturer writes the declaration of conformity. A dentist-made guard is a custom-made device and carries no UKCA mark at all.
Mouth guards are having their moment on the Amazon UK charts. On 26 September 2026, four of the twenty best-selling items in Sports & Outdoors were gum shields: OPRO's Silver Level at number two, SAFEJAWZ's Slim Fit at eight, GAME GUARD at nine and OPRO's Gold Level at fourteen. That is not one product getting lucky. It is a whole category moving at once, and the reason is the calendar. Club and school rugby and hockey seasons start in September, and a lot of parents are buying a gum shield in the same week they buy boots.
Almost every buying guide for these things opens by telling you a mouth guard is required. We went and read the rules. It mostly is not, and the place the requirement actually comes from is worth knowing before you spend anything.
Also awarded in this guide
OPRO Instant Custom-Fit Mouthguard
The top of OPRO's home-fitting range, and the one to look at if a player has given up on a guard before because it would not stay put.
£29.99
Check price on Amazon
SAFEJAWZ Slim Fit Gum Shield
Number eight on the chart and the cheapest thing here.
£9.99
Check price on Amazon
OPRO Gold Level Mouthguard for Braces
Braces change the problem. A guard moulded tight to bracketed teeth can lock on, and a guard that does not cover the brackets leaves the inside of the lip exposed to them.
£19.99
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How this page was made
Prices and specs last checked by Look Into on 26 September 2026 · re-check overdue (was booked for 8 November 2026) · how we picked
Prices in this table come from Amazon and are refreshed at least once a day, with the date of the last update under the table. The cost-per-use and running-cost figures on this page use prices Look Into read on 26 September 2026, so they can differ from today's price.
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What the rules actually say
Start with rugby. World Rugby's Law 4 covers permitted clothing. Law 4.2 says World Rugby recommends all players wear a mouthguard or dental protector. Law 4.3 then lists what a player may wear on top of the standard jersey, shorts, socks and boots, and mouth guards appear at 4.3(f), sitting in the same list as shin guards, mitts, headgear and goggles. Recommended, and permitted. Not required.
England Hockey takes the same line and says so more plainly. Its health and safety guidance strongly recommends wearing shin, ankle and mouth protection while playing hockey, with no separate rule for under-18s, and it does not make any of it mandatory. The one place it goes further is the penalty corner, where it says face masks should be worn across all age groups and playing formats by defenders, in line with FIH Rules of Hockey 4.2.
So who is making your child wear one? A club, a school or a league. Those bodies write their own conditions of participation, and plenty of them do make gum shields a condition of taking the pitch. That is a real requirement and worth complying with. It is just not the same thing as the sport's laws, and it means the rule you have to satisfy is the one on your club's website, not the one in the Amazon listing.
The other thing nobody mentions: what the UKCA mark on the box means
A mouth guard sold in Great Britain is a medical device, and it falls under the UK Medical Devices Regulations 2002. An off-the-shelf boil-and-bite is Class I, the lowest risk class, and gov.uk's conformity assessment guidance is direct about what that involves: if the manufacturer is satisfied the device complies with the requirements, the manufacturer writes a statement to declare it. No independent body checks a plain Class I guard before it goes on sale. The UKCA mark on that box is the maker's own word.
A guard made for you by a dentist works the other way round. It counts as a custom-made device, and gov.uk's guidance says you should not place a UKCA mark on a custom-made device at all. It still has to meet the requirements of the regulations and the maker still has to prepare a declaration, but you will not find a mark on it, and its absence is not a warning sign. Anyone selling you a shop guard on the strength of its marking, or worrying that their dentist's guard has none, has it backwards.
What follows from that is simple enough. Neither route gives you an independently tested product, so choose on fit, on how much material sits between the teeth and the impact, and on whether the player will actually keep it in.
How we picked these
We started from the Amazon UK Best Sellers chart for Sports & Outdoors on 26 September 2026 and from searches for rugby, braces and boxing guards, then picked six that each do a different job. Every product listing was opened on the day and the title and price read off the page. We have not put any of these in anyone's mouth, and we do not claim to have. Prices move, so treat the figures here as what Amazon showed on 26 September 2026.
How they compare
| Mouth guard | Best for | Fit |
|---|---|---|
| OPRO Silver Level | Club rugby | Boil and bite |
| OPRO Instant Custom-Fit | Closest fit without a dentist | Boil and bite |
| SAFEJAWZ Slim Fit | Calling and breathing | Boil and bite |
| OPRO Gold Level for Braces | Fixed braces, age 10+ | Fits over braces |
| SAFEJAWZ Ice Elements Junior | A junior's first season | Boil and bite, junior sizing |
| Shock Doctor Gel Max | Boxing and combat sports | Boil and bite, gel lining |
The six we would buy
OPRO Silver Level Mouthguard
Live price on Amazon (checked 26 September 2026)
The number two seller in Sports & Outdoors on the day we looked, and the sensible default for a Saturday club player. It is a standard boil-and-bite, it comes in adult and kids sizing, and it sits in the middle of OPRO's own ladder, which is where most of the volume goes.
The catch: the moulding process is identical to the Bronze version underneath it, so the step up buys you a different material spec. The fit is the same.
Check price on Amazon →OPRO Instant Custom-Fit Mouthguard
Live price on Amazon (checked 26 September 2026)
The top of OPRO's home-fitting range, and the one to look at if a player has given up on a guard before because it would not stay put. You get a closer mould than the Silver gives you, without the appointment and the lab bill.
The catch: it is twice the price of the Silver and it is still a guard you mould yourself over a kettle, so the "dentist level" in the product name describes an ambition. The fitting is still done by you, at home.
Check price on Amazon →SAFEJAWZ Slim Fit Gum Shield
Live price on Amazon (checked 26 September 2026)
Number eight on the chart and the cheapest thing here. The slim profile is the point: hookers calling lineouts, hockey captains and anyone who has to be understood at twenty metres tend to get on with a thinner guard, because a bulky one turns every instruction into mush. A case is included, which matters more than it sounds when the alternative is a kit bag floor.
The catch: slimmer means less material between a boot and your front teeth. That is the trade, and it is a real one for anyone playing in the front five.
Check price on Amazon →OPRO Gold Level Mouthguard for Braces
Live price on Amazon (checked 26 September 2026)
Braces change the problem. A guard moulded tight to bracketed teeth can lock on, and a guard that does not cover the brackets leaves the inside of the lip exposed to them. This one is built to sit over the fixed appliance as a whole, and the listing rates it for age 10 and over.
The catch: that age rating rules it out for a younger child already in early orthodontic treatment, which is exactly the group that most needs something like it. Ask the orthodontist.
Check price on Amazon →SAFEJAWZ Ice Elements Dual Layer Junior
Live price on Amazon (checked 26 September 2026)
Junior sizing and a dual-layer build, which gives a softer inner surface against the gums and a firmer outer one. For a child starting mini rugby or school hockey this autumn it is about the right amount of money to spend on something that may well end up in a hedge by half term.
The catch: children grow, and a junior guard that fitted in September can be loose by spring. Budget for replacing it. It will not last the way boots do.
Check price on Amazon →Shock Doctor Gel Max Mouth Guard
Live price on Amazon (checked 26 September 2026)
The one non-rugby name on this list, and a fixture in boxing and martial arts gyms. The gel lining is there to take repeated straight impacts. That is a different loading pattern from an occasional accidental blow, such as a hockey stick to the face.
The catch: this guard is listed several times over on Amazon UK at different prices for what looks like the same thing, and the strapped and unstrapped versions are hard to tell apart in the photos. Check which version you are buying.
Check price on Amazon →Questions people ask
Do the laws of rugby require a mouth guard?
No. World Rugby Law 4.2 says World Rugby recommends all players wear a mouthguard or dental protector, and Law 4.3(f) lists a mouth guard or dental protector among the additional items a player is permitted to wear. Any compulsion you are under comes from your club, school or league.
Does England Hockey make gum shields mandatory?
No. England Hockey strongly recommends wearing shin, ankle and mouth protection while playing hockey, across all ages, and does not make it mandatory. It goes further only on penalty corners, where it says face masks should be worn across all age groups and playing formats when defending one, in line with FIH Rules of Hockey 4.2.
Should a dentist-made mouth guard have a UKCA mark on it?
No, and its absence is not a problem. Under the UK Medical Devices Regulations 2002, gov.uk says a UKCA mark should not be placed on a custom-made device, although the maker must still meet the regulations' requirements, label the type of device clearly and draw up a statement declaring compliance.
Is a boil-and-bite guard independently tested?
Not as a rule. A plain Class I medical device is self-declared: gov.uk's guidance says that if the manufacturer is satisfied the device complies with the requirements of the regulations, the manufacturer writes a statement to declare it. An approved body only has to get involved where a device is sterile or has a measuring function, which a gum shield is not and does not.
Can you wear a mouth guard over fixed braces?
Yes, with a guard built for it. Braces guards are shaped to sit over the appliance as a whole and are not moulded tight to each tooth. The OPRO Gold Level for Braces here is rated for age 10 and over. For a younger child in treatment, ask the orthodontist which guard they want used.
Sources
- World Rugby, Laws of the Game, Law 4: Permitted clothing
- England Hockey, Are gum shields, shinpads or face-masks mandatory for Under 18s (or others)?
- GOV.UK, Medical devices: conformity assessment and the UKCA mark
- Amazon.co.uk Best Sellers, Sports & Outdoors, read 26 September 2026
Prices were read on Amazon.co.uk on 26 September 2026 and change without notice. The live comparison table pulls Amazon's own product feed, which can sit slightly off the buy box price you see on the product page. Look Into is a participant in the Amazon EU Associates Programme and earns from qualifying purchases. This costs you nothing and does not affect which products we pick.
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