The systematic oral exam: outside in

What it is

The oral exam starts outside the mouth and works in, always in the same order so no area is missed. It needs good light, gloves, gauze to hold the tongue and two tongue depressors (or a dental mirror). Dentures must come out first. The aim is to see the teeth and gums, every mucosal surface, and to feel the lymph nodes and any lump, because most oral cancers are painless at first and sit in places the patient cannot see.

Findings and interpretation

• The lateral border of the tongue and the floor of the mouth are the commonest sites of oral squamous cell carcinoma.
• A red patch (erythroplakia) is more likely to be malignant than a white patch (leukoplakia).
• A lesion that is hard (indurated), fixed, or does not heal in two to three weeks needs a biopsy.
• Linea alba, Fordyce spots (yellow sebaceous glands), tori (bony lumps of palate or lower jaw) and a fissured tongue are normal variants.
• Gums that bleed when gently touched indicate gingival inflammation.

How it is done

1. Look at the face for asymmetry or swelling; feel the TMJs while the patient opens and closes; measure opening.
2. Palpate the lymph nodes of the neck (submental, submandibular, cervical chains) and the parotid and submandibular glands.
3. Inspect the lips with the mouth closed and open, then the labial and buccal mucosa, gently retracting the cheeks.
4. Look at the gingiva and each tooth: decay, fractures, mobility, plaque and calculus, bleeding gums.
5. Ask the patient to raise the tongue: inspect the floor of the mouth and the underside of the tongue.
6. Hold the tongue tip in gauze, pull it to each side and inspect the lateral borders, the highest-risk site for cancer.
7. Inspect the hard and soft palate, the tonsillar pillars and the oropharynx while the patient says «ah».
8. Palpate the tongue and floor of mouth with two hands (bimanual) to feel any lump or hardness.

Common mistakes

• Skipping the denture removal hides the lesions under the denture.
• Looking only at the tip of the tongue misses the lateral borders and floor of the mouth.
• Not palpating misses deep, submucosal tumours that look almost normal.

Next step / Initial management

• Normal exam: advise a dental check every six to twelve months and record findings in the history.
• Ulcer, white or red patch that persists two to three weeks after removing any cause: refer for biopsy (dentist, oral and maxillofacial surgery or ENT).
• Hard, fixed lump, numbness or a fixed neck node: urgent referral for suspected cancer.
• Decayed or broken teeth, bleeding gums or loose teeth: refer to the dentist.

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Elsewhere in DurgiPedia

• Mouth and pharynx examination
• Oral cavity and oropharynx exam

Connections

← All of dentistry

Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.

Sources: Oral Health Considerations for Patients With Systemic Disease (StatPearls Publishing (NCBI Bookshelf), 2025); Cancer of the Oral Mucosa (StatPearls Publishing (NCBI Bookshelf), 2024); Oral Cancer (National Institute of Dental and Craniofacial Research (NIDCR, NIH), 2024).

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Representative model, for educational purposes only.