18.2 Dental Anxiety and Phobia

Scale of the Problem

Dental anxiety affects a substantial minority of the UK adult population, and the Adult Dental Health Survey has consistently found that roughly one adult in ten has extreme dental anxiety. The clinical consequence is a vicious cycle: anxiety leads to avoidance, avoidance leads to deterioration, deterioration leads to symptomatic emergency attendance and more invasive treatment, which reinforces the anxiety.

Preparing for Practice outcome 1.7.4 requires registrants to "prevent, diagnose and manage patient anxiety appropriately, effectively and safely", and outcome 1.2.5 requires assessment of patients' levels of anxiety, experience and expectations.

Distinguishing Anxiety, Fear and Phobia

• Dental anxiety — a generalised state of apprehension about dental treatment.
• Dental fear — a reaction to a specific identified threat, such as the needle.
• Dental phobia — a persistent, excessive and unreasonable fear producing marked avoidance and functional impairment, meeting diagnostic criteria for a specific phobia.
• Blood-injection-injury phobia is distinct and important because it produces a biphasic vasovagal response: an initial rise in heart rate and blood pressure followed by a sharp fall and fainting. These patients should be treated supine and should not be encouraged to sit up quickly.

Measuring Anxiety

Validated instruments allow anxiety to be recorded, communicated and re-measured. The one in routine UK use is the Modified Dental Anxiety Scale (MDAS):

• Five questions, each scored from 1 (not anxious) to 5 (extremely anxious)
• Total range 5 to 25
• A score of 19 or above indicates high dental anxiety and identifies a patient who is likely to need additional support or sedation

Other tools include Corah's Dental Anxiety Scale, the Dental Fear Survey and, for children, the Modified Child Dental Anxiety Scale (MCDAS) and the Venham picture test. Recording an MDAS score in the notes makes anxiety a measurable, reviewable clinical problem rather than an impression.

Managing the Anxious Patient

Non-pharmacological approaches come first, and they are effective.

Pharmacological approaches are adjuncts, not substitutes, and each has a place:

• Inhalation sedation with nitrous oxide — first line for most anxious children and many adults; rapid onset and recovery, high safety margin.
• Intravenous midazolam — for adults with higher anxiety or longer procedures, with the titration and monitoring standards set out in the sedation chapter.
• General anaesthesia — only in a hospital setting and only where no less invasive option is appropriate.

A key principle is that sedation is not a treatment for dental phobia. It permits a single episode of care. Without a behavioural component, the patient returns as anxious as before and becomes dependent on sedation for all future treatment. Best practice combines sedation for the immediate need with graded exposure or cognitive behavioural work to move the patient towards treatment without sedation.

Preventing Iatrogenic Anxiety

Much dental anxiety is created in the surgery. The evidence points repeatedly to the same causes:

• Painful experiences, especially unexpected pain during a procedure the patient was told would not hurt
• Perceived loss of control, including ignoring an agreed stop signal
• Perceived lack of empathy or feeling judged about the state of the mouth
• Vicarious learning from an anxious parent, which is why parental anxiety predicts child anxiety

Exam link. A patient with an MDAS score of 21 who has avoided dentistry for ten years needs a documented anxiety score, an agreed stop signal, short non-invasive acclimatisation visits, and a discussion of sedation as an adjunct. Proceeding directly to extraction under general anaesthesia without exploring less invasive options is not a defensible first answer.

Practical Techniques and Their Limits

The examinable hierarchy is that behavioural and psychological management comes first and pharmacological management is an adjunct, never a substitute. Effective behavioural measures include giving the patient control through a stop signal, structured relaxation and controlled breathing, distraction, graded exposure starting with non-threatening procedures, and careful attention to the environment — appointment timing, waiting time, the sound and sight of instruments, and the language used. Words matter: "injection", "drill" and "pain" are replaced with neutral alternatives, and the patient is never told a procedure will not hurt if it might.

Where anxiety is severe, cognitive behavioural therapy delivered by a trained practitioner has the best evidence for durable change, whereas sedation manages a single appointment without altering the underlying fear. That distinction — sedation enables treatment, psychological therapy treats the anxiety — is the point an SBA about a needle-phobic patient requiring ongoing restorative care is usually testing.