It happens on almost every card. A punch lands, the gumshield comes flying out, and the fight just… carries on.
Ten seconds pass. Twenty. The fighter is still throwing punches with no mouthpiece in, and the referee is doing nothing about it. That is not an oversight. It is the rule working exactly as intended.
What Happens If a UFC Fighter’s Mouthpiece Falls Out?
If a UFC fighter’s mouthpiece falls out, the referee waits for a safe moment, then calls time, has the mouthpiece rinsed (cleaned), and puts it back in. The fight does not stop the instant it comes out. The referee looks for a natural break — a point where neither fighter is in a dominant or advantageous position.
That delay is deliberate, and it is the whole point of the rule.
Why Doesn’t the Referee Stop the Fight Immediately?
Because stopping the fight immediately would reward the fighter who lost the mouthpiece. A fighter who is being badly hurt would get a free rest every time a punch knocked their gumshield loose.
So the referee holds off. If a fighter is mid-flurry and their opponent’s mouthpiece flies out, the referee lets the sequence play out and calls time when the action naturally stalls — a clinch, a reset, a moment of separation.
It is the same principle as the stand-up and the fence-grab restart: a foul or an accident must not hand a fighter an advantage he did not earn.
Can a UFC Fighter Be Penalised for Spitting Out Their Mouthpiece?
Yes. Points may be deducted if the referee believes a fighter is purposefully spitting out their mouthpiece. It falls under the foul of timidity — and it is one of the few fouls that involves no contact at all.
The reasoning is straightforward. A tired or hurt fighter who spits out their gumshield buys themselves a break in the action. Do it once and you will get a warning. Do it repeatedly and the referee will treat it as exactly what it is.
What Is Timidity In the UFC?
Timidity is a listed foul in the Unified Rules covering avoiding contact with an opponent, faking an injury, or intentionally and consistently dropping the mouthpiece. It is the rule against running away and stalling.
It is one of the strangest fouls in the book, because it punishes a fighter for doing too little rather than too much. But without it, a fighter with a lead could simply spend five minutes not fighting.
Can a UFC Round Start Without a Mouthpiece?
No. A UFC round cannot begin without a mouthpiece. It is mandatory equipment, checked before a fighter walks out, and the referee will not restart the action until it is back in.
It is worth noting how absolute this is. There is no version of the rules where a fighter chooses to fight without one, however much they might prefer to breathe freely.
Why Do Mouthguards Fall Out So Often In the UFC?
Mouthguards fall out because a hurt fighter’s jaw goes slack, and because a fighter gasping for air opens their mouth wide. A poorly fitted boil-and-bite gumshield makes both problems considerably worse.
This is why experienced commentators treat a lost mouthpiece as a tell. It is very often not the punch that dislodged it — it is the fact that the fighter’s jaw stopped holding it in. A gumshield hitting the canvas is frequently the first visible sign that somebody is badly hurt.
A properly fitted custom guard is far harder to lose, which is one reason elite fighters invest in them. See our guide to the best MMA mouthguards.
What Does a Mouthguard Actually Protect?
A mouthguard protects the teeth, the jaw, the lips and the tongue. It cushions the teeth against impact and stops the jaw slamming shut on soft tissue.
What it does not reliably do is prevent concussion, whatever the marketing on the packet says. The evidence that mouthguards meaningfully reduce brain injury is limited and contested. They are dental and soft-tissue protection first, and anything beyond that should be treated as a claim rather than a fact.
When Does the Referee Call Time for a Lost Mouthpiece?
The referee calls time at the first moment that does not hand either fighter an advantage — a clinch, a reset, a break in the action. If a fighter is being hurt when their mouthpiece comes out, the referee will let the sequence finish.
| Situation | What the referee does |
|---|---|
| Mouthpiece knocked out mid-exchange | Lets the action play out; calls time at a natural break |
| Mouthpiece out, fighters in a neutral position | Calls time straight away |
| Mouthpiece out while a fighter is in trouble | Waits. Stopping now would reward the hurt fighter |
| Fighter spits it out repeatedly | Warning, then a point deduction under timidity |
| Fighter arrives at the cage without one | The fight does not start |
The principle behind all of it: an accident must not buy a fighter a rest he did not earn.
What Happens If a Fighter Keeps Losing Their Mouthpiece?
A fighter who keeps losing their mouthpiece will first be warned, and then penalised. Repeatedly and consistently dropping the mouthpiece is explicitly listed as timidity, whether the fighter is doing it deliberately or simply cannot keep it in.
That second part is the harsh bit. The rule does not care whether your gumshield is badly fitted. If it keeps ending up on the canvas and the referee decides the pauses are benefiting you, the points come off anyway.
Which is a fairly expensive argument for spending money on a mouthguard that actually fits.
Can a UFC Fighter Fight Without a Mouthpiece If They Want To?
No. A UFC fighter cannot choose to fight without a mouthpiece. It is mandatory equipment under the Unified Rules, and the referee will not restart the action until it is back in — regardless of the fighter’s preference.
Fighters have complained about it for years, because a gumshield makes breathing harder and talking almost impossible. The commissions have never wavered, and they are not going to.
FAQs
Do UFC fighters have to wear a mouthguard?
Yes. A mouthguard is mandatory equipment in the UFC, inspected before a fighter walks to the cage.
Does the referee clean the mouthpiece before putting it back?
Yes. The mouthpiece is rinsed before it is returned, which is why you see a cornerman or official with a water bottle during the pause.
Can a fighter lose a point for spitting out their mouthpiece?
Yes. If the referee judges it deliberate, it is a foul under timidity, and points may be deducted.
Why do fighters keep fighting with no mouthpiece in?
Because the referee has not stopped the action yet. He is waiting for a moment where calling time does not give either fighter an advantage.
Do UFC fighters wear a top and bottom mouthguard?
Most wear a single upper guard. Double guards exist but are far less common, because they make breathing and communication harder.
To Conclude
A lost mouthpiece does not stop a UFC fight. The referee waits for a moment when calling time costs nobody an advantage, then pauses, rinses it and puts it back.
And if he thinks you spat it out on purpose, it can cost you a point — because in the UFC, buying yourself a rest is a foul.
For more, read our guides to illegal moves in the UFC, what UFC referees do, UFC fighter safety, and the best MMA mouthguards.
