Capacity, Best Interests, and Country-Specific Law

Mental capacity is the ability to make a specific decision at the time it needs to be made. A person may have capacity for one decision but not another, and capacity can fluctuate. Dental nurses do not carry out formal capacity assessments for treatment, but their observations and communication can help the dentist avoid assumptions and respond appropriately.

Capacity principles in practice

• Start by assuming the patient has capacity unless there are clear reasons to doubt it.
• Support decision-making where possible by adjusting communication and allowing time.
• An unwise choice does not, by itself, indicate lack of capacity.
• If a person lacks capacity, follow the relevant legal framework and act in the person's best interests or under the required safeguards.

A patient may have difficulty deciding because of dementia, learning disability, delirium, acute illness, severe anxiety, intoxication, medication effects, pain, or shock. The first response should usually be supportive. Break information into smaller steps, reduce distractions, reassess timing, and involve the dentist if the patient cannot understand, retain, use, weigh, or communicate the decision.

Carers can provide helpful information about the person's usual communication, preferences, oral care, past wishes, and anxieties. They are not the decision-maker unless they hold the correct legal authority; even then, the patient's views and dignity remain central.

UK capacity law differences

Capacity concerns should lead to better support and careful escalation, not to the patient being spoken over or treated as absent from their own care.