Buccal Muscles Explained: Anatomy, Function and Dental Relevance

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!Diagram illustrating oral anatomy and cheek muscle structure in relation to dental health Image: Understanding oral anatomy supports better dental health awareness.

When people talk about the buccal muscles, they are usually referring to the muscles of the cheek — most importantly, a powerful and often underappreciated muscle called the buccinator. Understanding the anatomy of this region can help you make more sense of how your mouth works during everyday activities like eating, speaking and facial expression — and why your dental team sometimes refers to the "buccal" side of your teeth during a check-up.

This guide explains the anatomy of the buccal region clearly and accurately, distinguishing muscles from nerves, soft-tissue folds and anatomical spaces. It also addresses some common misconceptions about buccal massage and what the evidence currently supports.

What are buccal muscles? The term "buccal muscles" most accurately refers to the buccinator — a flat, paired muscle forming the core of each cheek wall. It keeps food between the upper and lower teeth during chewing, assists in blowing and whistling, and contributes to facial expression. The buccinator is the primary muscular structure of the buccal (cheek) region.

The word buccal derives from the Latin bucca, meaning cheek. In dentistry and anatomy, "buccal" is used as a directional term — for example, the buccal surface of a tooth is the surface closest to the cheek. The broader buccal region includes muscles, a layer of fat, nerves, soft-tissue folds and anatomical spaces, which is why several different structures carry the word "buccal" in their name.

This can cause confusion. Not everything described as "buccal" is a muscle. Understanding the difference matters both anatomically and clinically.

The buccinator is a thin, quadrilateral muscle that forms the muscular base of each cheek. It sits deep to the subcutaneous fat of the face and is covered on its inner surface by the oral mucosa — the moist lining of the mouth.

Where is the buccinator located?

The buccinator originates from three points: - The outer surface of the upper jaw (maxillary alveolar process), adjacent to the upper molar teeth - The outer surface of the lower jaw (mandibular alveolar process), adjacent to the lower molars - The pterygomandibular raphe — a fibrous band that connects the upper and lower jaw and also serves as the attachment point for the superior pharyngeal constrictor muscle at the back of the throat

The fibres of the buccinator run horizontally and converge at the corner of the mouth, where they blend into the orbicularis oris — the circular muscle that surrounds the lips.

The buccinator has several clearly established functions, all of which are relevant to everyday oral health and function.

The buccinator's most important role is to assist in chewing. As you chew, the tongue and buccinator work in coordination to keep food positioned between the upper and lower teeth. Without this muscular action, food would constantly fall into the vestibule — the groove between the cheek and the gum — making chewing inefficient and uncomfortable.

If you have ever had temporary numbness following a dental injection in the cheek area, you may have noticed that chewing feels slightly uncoordinated. This is partly because the buccinator is temporarily affected, illustrating how integral it is to normal oral function.

The buccinator helps compress the cheeks inwards, which is why it is sometimes described as the "trumpeter's muscle." It plays a direct mechanical role in blowing out a candle, playing a wind instrument or whistling.

By maintaining tone and shape in the cheek wall, the buccinator contributes to the oral phase of swallowing and to certain speech sounds, working alongside the tongue and lips to shape the oral cavity during phonation.

The phrase buccal cavity muscles is sometimes used in searches, but it is worth clarifying what it means anatomically.

The oral cavity is the space inside the mouth. It is divided by the teeth and gums into two regions:

1. The oral vestibule — the narrow groove between the lips and cheeks on one side, and the teeth and gums on the other

2. The oral cavity proper — the main space of the mouth, bounded by the hard palate above, the tongue below, and the cheeks on either side

The buccinator forms the lateral (side) wall of both the vestibule and the oral cavity proper. Other facial muscles — including the zygomaticus major and minor, the levator labii superioris, the risorius, the depressor anguli oris and the mentalis — contribute to facial expression and lip movement but are not primary muscles of oral function in the same way as the buccinator.

Together, these facial muscles are supplied by the facial nerve (cranial nerve VII), which carries motor signals from the brain to control movement. This is distinct from sensory supply, which is covered separately below.

Searches for buccal nerve muscles often reflect a reasonable curiosity about what the buccal nerve does. However, it is important to clarify the distinction here.

The long buccal nerve (also called the buccal branch of the mandibular nerve, or cranial nerve V3) is a sensory nerve — it carries sensory information from the skin and mucous membrane of the cheek to the brain. It does not innervate any muscles.

The buccinator itself is innervated motorically by the buccal branches of the facial nerve (cranial nerve VII), not the long buccal nerve. In plain English:

• Facial nerve (VII) → motor supply → moves the buccinator and other facial muscles

• Long buccal nerve (V3) → sensory supply → conveys touch and pain from the cheek lining and skin

This distinction matters clinically. When a dentist administers a local anaesthetic to the lower jaw, it can temporarily numb the sensory supply of the cheek via the buccal nerve — which is why the inside of your cheek may feel numb, even though the muscles themselves continue to function.

At Wimpole Dental, our clinicians are trained to explain what to expect from different types of anaesthesia before any treatment, helping you feel informed and at ease throughout your appointment.

The buccal space is sometimes mentioned in patient education and clinical discussions. It is important to clarify that it is not a muscle — it is an anatomical space, or potential compartment, located between the buccinator muscle medially and the overlying skin laterally.

This space contains the buccal fat pad — a distinct mass of encapsulated fat that contributes to the fullness of the cheek — along with small blood vessels and the parotid duct (which carries saliva from the parotid gland into the mouth).

Clinically, the buccal space is relevant because dental infections, particularly from lower molar teeth, can occasionally spread into this space, causing visible swelling of the cheek. This is one reason why untreated dental infections should never be ignored. If you notice persistent or unexplained swelling in your cheek, seeking prompt professional assessment is advisable.

Searches related to buccal frenum muscles are common, but the buccal frenum — or buccal frenulum — is not a muscle. It is a small fold of mucous membrane (the same moist tissue that lines the inside of the cheeks and lips) that connects the inner surface of the lip or cheek to the adjacent gum.

Most people have a buccal frenum on both sides of the upper and lower jaws, visible as a thin vertical band of tissue when the lip is pulled outward.

The frenum contains connective tissue and may include minor muscle fibres from adjacent muscles, but it is not classified as a standalone muscle in its own right. In some individuals, a frenum that is particularly thick or tight can be associated with gum recession around adjacent teeth — a situation that a dentist or periodontist can assess if needed.

If you have questions about gum health or tissue around your teeth, our team can carry out a thorough gum health assessment as part of your dental care.

Buccal massage — sometimes called intraoral facial massage — has attracted significant attention in aesthetic and wellness circles. The practice involves applying massage techniques to the muscles and soft tissues of the cheek, both externally and through the inside of the mouth.

It is important to distinguish between what is biologically plausible, what is claimed and what is currently supported by good-quality clinical evidence.

Buccal massage typically involves: - External manipulation of the cheek muscles, including the buccinator and overlying tissues - Intraoral pressure applied through gloved fingers to the inner cheek lining - Techniques aimed at releasing tension in the muscles of mastication

There is some plausible basis for the idea that facial massage can temporarily influence blood flow and soft-tissue tone. However, claims that buccal massage permanently removes facial fat, sculpts facial bones, lifts sagging tissue or produces lasting structural change are not supported by robust clinical evidence.

The buccal fat pad — which sits within the buccal space — is not significantly altered by external massage. Its volume is determined primarily by genetics, body composition and age, rather than by external pressure.

If you are considering any form of facial aesthetic treatment, it is important to consult a qualified healthcare professional, understand the limitations of the evidence, and have a thorough consultation before proceeding.

The buccinator and surrounding structures are assessed, at least indirectly, during routine dental examinations. Your dentist will examine the soft tissues of the cheek as part of an oral cancer screening check — something that is carried out at every routine examination at Wimpole Dental.

Some symptoms in the buccal region that may warrant professional assessment include:

• Persistent cheek swelling that does not resolve

• White or red patches on the inner cheek lining

• A lump or thickening of the cheek tissue

• Unexplained pain or numbness in the cheek area

• Trismus (difficulty opening the mouth)

None of these symptoms automatically indicates a serious condition — there can be many explanations — but persistent or unexplained changes should always be evaluated by a dental or medical professional rather than self-monitored.

You can learn more about what a comprehensive dental examination at Wimpole Dental includes, or explore our oral cancer screening page for further information.

The information in this article is intended for general educational and informational purposes only. It does not constitute professional dental or medical advice and should not be used as a substitute for a clinical consultation with a qualified dental or healthcare professional. The anatomy and functions described apply to general populations; individual anatomy, symptoms and clinical findings vary between patients.

Nothing in this article is intended to provide a diagnosis, and no specific treatment outcomes are guaranteed. If you have concerns about your oral health, cheek tissues, jaw function or any symptoms described in this article, please seek assessment from a suitably qualified dental professional.

Written Date: 23 October 2026

Next Review Date: 23 October 2027