Denhardt Mouth Gag, Side Gag with Ratchet

What the Denhardt mouth gag is

The Denhardt mouth gag is a side gag. It goes in between the back teeth on one side of the mouth, its two tooth plates resting on the upper and lower teeth, and its arms are squeezed apart to open the jaw. A ratchet catches each step of the opening and holds it, and a lever at the side lets it go. The front and the other side of the mouth stay free for the surgeon.

Google AI Mode, read on 5 November 2026, describes the Denhardt mouth gag as a surgical instrument used in oral, maxillofacial and laryngology procedures to give controlled retraction and hold the mouth open. In its words, it has a ratcheted or locking grip that holds a stable opening without unexpected closure, so the view and the access to the field stay the same through the case. It names tonsillectomy and adenoidectomy, cleft palate repair, intraoral biopsy or tumor removal, and long dental work.

Gemini, read the same day, places it in oral and maxillofacial surgery, pediatric dentistry and ENT, on the premolars and molars, the alveolar ridges and the soft tissue of the cheek. It lists the Denhardt jaw spreader as a catalog name, and sets it apart from the Heister by its ratchet: the Denhardt spreads by a squeeze and holds on a ratchet, where the Heister is opened by turning a screw.

As a medical mouth gag its whole job is to keep the mouth open so the surgeon can work with both hands while the jaw muscles push to close it. The ratchet mouth gag pattern does that in steps, each one held until the lever is pressed.

Key design features

Tooth plates at the tips

Our photograph shows a flat plate at the tip of each arm. The plates sit on the biting surfaces of the upper and lower back teeth and spread the load across them, rather than pressing on one tooth. AI Mode describes other makers fitting bite blocks here; ours are plain steel plates.

A ratchet that locks the opening

A toothed arc runs between the arms, and a catch rides along it as the gag opens. Each step is held as soon as it is reached, so the opening can be set wide or narrow and stays there. A gag that creeps closed during a case is one that has to be reset with the instruments already in the mouth.

A release lever at the side

The lever in our photograph sits on the side of the gag, clear of the mouth. Pressed, it lifts the catch off the ratchet and the arms close under the jaw’s own pull. The surgeon or the assistant can release it with one finger at the end of the case.

A side gag

Because the Denhardt sits on one side, the front teeth, the palate and the other side of the mouth are left open to view. For work on the palate or the tonsils that is the reason to choose it over a frame gag. As a stainless steel mouth gag it goes through the steam cycle whole, with no inserts to change.

What the listing gives you

One pattern at one price, read off the listing on 5 November 2026. What it tells you is set out below, and where each detail was read from.

Where it is used

AI Mode and Gemini, read on 5 November 2026, name these cases for the Denhardt mouth gag. The reasons in the last column are ours, read off the plates and the ratchet.

What it does, and what it must not do

The Denhardt mouth gag holds the jaw open from one side. It does not hold the tongue down and it does not retract the cheeks. Beside a tongue depressor it gives the full view of the throat.

How it compares with the rest of the oral access tray

Ten oral access instruments make up this family on our site. The working ends and handles are read off each listing’s own photograph, the options off the variations and the prices off the order form, on 5 November 2026.

Materials and finish

Every Denhardt mouth gag we make is formed from high quality medical grade stainless steel. The steel itself is made to a German specification. We do not publish a grade number.

The Denhardt mouth gag has a plain steel finish. Check the ratchet before each case. Teeth worn round on the arc let the catch slip, and a gag that slips closed is unsafe, so it should be set aside.

Caring for it

Rinse the Denhardt mouth gag as soon as the case ends, before saliva and blood dry in the joint and on the ratchet. Brush the plates, the joint and the arc, wash it, dry it, and steam sterilize it on the normal cycle with the gag open. A drop of instrument lubricant on the joint keeps the action smooth.

Ordering and wholesale

The Denhardt mouth gag is made by Adas Instruments in our own workshop and sold direct, which is why the price sits where it does against the catalog houses. Order one for a single tray, or in quantity for a hospital list or a distributor line. We do OEM work under your own brand and your own item numbers. Send us a sample and we will hold a run to your pattern rather than ours. Stock items ship from our own workshop. Backorder items take 10 to 12 working days to make. Every instrument carries a three year replacement warranty against manufacturing defects. Production is controlled under an ISO 13485 quality management system.

Frequently asked questions

What is the Denhardt mouth gag used for?

It holds the mouth open with a steady, locked opening in oral, maxillofacial and throat surgery, in AI Mode’s words, including tonsillectomy, cleft palate repair and intraoral biopsy. Ours has tooth plates and a ratchet, at 36 dollars.

What is a mouth gag used for in surgery?

It keeps the mouth open while the jaw muscles push to close it, so the surgeon can work inside with both hands. A side gag like the Denhardt holds from the back teeth on one side; a frame gag like the Dingman holds the whole mouth.

How does the Denhardt ratchet work?

A toothed arc runs between the arms and a catch rides along it. As the arms open, each step is held. Pressing the lever at the side lifts the catch, and the gag closes. Our photograph shows the arc and the lever.

What is the difference between the Denhardt and the Heister?

Both hold the mouth open from the teeth. The Denhardt opens by a squeeze and holds on a ratchet. The Heister opens by turning a screw with a broad thumb disc, and holds wherever the screw stops.

Can it be autoclaved?

Yes. It is stainless steel with no coating or inserts, and it goes through the normal steam cycle with the rest of the tray. Sterilize it with the arms open, so steam reaches the joint and the ratchet, and dry it fully.

Related products and categories

Three more instruments from the same oral access tray: the Dingman mouth gag complete set, the Heister mouth gag and the Roser-Koenig mouth gag. The rest of the range is under maxillofacial instruments, which sits inside our ENT instruments.