18.1 Health Behaviour Models and Behaviour Change

Why Behavioural Science Is Examined

"Behavioural sciences relevant to oral health care" is the first topic listed in the Paper A blueprint, and Preparing for Practice outcome 1.1.13 requires registrants to "explain, evaluate, and apply to clinical practice psychological and sociological concepts and theoretical frameworks of health, illness, behavioural change and disease". Step 1 of the British Society of Periodontology treatment framework is behaviour change, not instrumentation. Almost every preventive intervention in dentistry depends on persuading someone to do something differently at home.

Telling patients what to do does not work, and the models below explain why.

The Main Theoretical Models

The single most transferable idea is self-efficacy. Knowledge is necessary but never sufficient; patients change when they believe the change is achievable for them.

Motivational Interviewing

Motivational interviewing is a collaborative, patient-centred style for resolving ambivalence. Its defining feature is that the clinician elicits the arguments for change from the patient rather than supplying them. Confrontation produces defensiveness, which psychologists call the righting reflex trap: the more the clinician argues for change, the more the patient argues against it.

The four processes are engaging, focusing, evoking and planning, supported by the OARS skills:

• Open questions — "What have you noticed about your gums recently?"
• Affirmations — "You have managed to cut down from twenty to twelve a day, which is not easy."
• Reflective listening — "So you would like to stop, but you are worried about the weight gain."
• Summaries — pulling the change talk together before moving to planning.

Motivational interviewing has the strongest evidence in dentistry for smoking cessation, dietary change and caries prevention in young children.

Very Brief Advice and Smoking Cessation

UK practice uses the Very Brief Advice (VBA) structure, which takes about 30 seconds and is what NICE and Delivering Better Oral Health expect of every dental team member:

1. ASK and record smoking status at every appointment.
2. ADVISE that the best way of stopping is with a combination of behavioural support and pharmacotherapy.
3. ACT by referring to a local stop-smoking service, or offering or signposting support.

Alcohol is addressed with a comparable brief intervention, screening with a tool such as AUDIT-C and delivering brief advice where consumption exceeds the UK low-risk guideline of 14 units per week for both men and women, spread over three or more days.

Applying This in the Surgery

• Ask permission before giving advice: "Would it be alright if we talked about your brushing?"
• Give information in small pieces, then check understanding with the teach-back method rather than asking "does that make sense?"
• Set one specific, achievable goal rather than a list. "Use the interdental brush on the lower back teeth every night before bed" outperforms "clean between all your teeth."
• Plan for relapse explicitly; framing relapse as failure makes patients disengage rather than return.

Exam link. A stem describing a patient who says they know they should stop smoking but enjoy it and are not ready to quit places them in the contemplation stage. The correct answer is to explore ambivalence and offer support when ready, not to repeat the health warnings they have already heard.

From Model to Conversation

Behavioural models earn their place in the blueprint because they change what the clinician says. The health belief model predicts that a patient acts when they believe they are susceptible to a serious condition, that action would benefit them, and that the barriers are manageable — so the useful conversation explores which of those beliefs is missing rather than repeating the instruction. Social cognitive theory identifies self-efficacy as the key determinant, so the useful intervention is to break the task into an achievable step and to build confidence through success. The transtheoretical (stages of change) model predicts that advice aimed at a precontemplative patient is wasted, so the useful action is to raise awareness and leave the door open rather than to issue a plan.

Why "Telling" Fails

The single most examinable insight is that information alone rarely changes behaviour. Patients with excellent knowledge continue to smoke, snack and neglect interdental cleaning; the gap is not knowledge but motivation, confidence, habit and circumstance. Confrontation produces resistance — the patient argues for the status quo and becomes less likely to change. The techniques that do work are collaborative: asking permission before giving information, eliciting the patient's own reasons for change, reflecting ambivalence back without judgement, and setting a small, specific, patient-chosen goal that is reviewed at the next visit. When a stem describes a clinician repeating oral hygiene instruction for the fourth visit with no improvement, the expected answer is to change the approach, not to repeat the message more firmly.