Two conversations about habits

Correct answer: B. Reduce the frequency of consumption, rinse with water or milk afterwards, and delay brushing for about an hour

• A. Enamel already lost cannot be regrown, but PROGRESSION is entirely preventable — which is the whole point of the consultation. Doing nothing in a 26-year-old with this rate of loss is indefensible.
• B. CORRECT. Two levers matter. FREQUENCY of the acid challenge matters more than total quantity, so reducing how often she eats them is the primary intervention. And what happens immediately AFTER each exposure matters nearly as much: rinse with plain water, milk or a fluoride mouthrinse to neutralise and clear the acid, and DELAY BRUSHING for about an hour to let the softened surface remineralise before any mechanical contact.
• C. This is worse rather than better. Turning the fruit into a drink sipped through the day MULTIPLIES the number of separate acid exposures, and frequency is the variable that matters most. A drink taken quickly at a mealtime, ideally through a straw, is less damaging than the same volume sipped over an hour.
• D. This is the specific error the question exists to test, and it is what the patient is currently doing. After an acid challenge the enamel surface is transiently SOFTENED, and brushing it immediately mechanically removes that softened layer — converting erosion into erosion PLUS abrasion and accelerating the loss substantially.

Note: Add high-fluoride toothpaste (5000 ppm), a soft brush with a non-abrasive paste, and monitoring with study casts or standardised photographs so progression can actually be measured. Her bruxism compounds the loss, so a hard splint is indicated. And note the distribution: SPARED palatal surfaces argue for an EXTRINSIC dietary source rather than an intrinsic one. Where the palatal surfaces ARE affected, exclude gastro-oesophageal reflux and disordered eating.

Correct answer: D. A nicotine lozenge used alone

• A. Bupropion performs roughly comparably to single-form nicotine replacement. It is generally a second-line choice because of its neuropsychiatric warnings and its lowering of the seizure threshold.
• B. COMBINATION nicotine replacement — a patch providing steady baseline levels plus a gum, lozenge, inhaler or spray for breakthrough cravings — performs comparably to varenicline and is clearly superior to any single form. This is the combination to recommend when a patient prefers nicotine replacement.
• C. VARENICLINE is the MOST effective single agent of those listed, roughly doubling to tripling quit rates and outperforming single-form nicotine replacement and bupropion in head-to-head trials. It is a partial agonist at the alpha-4 beta-2 nicotinic receptor, which both relieves craving and blunts the reward of smoking if the patient does smoke.
• D. CORRECT. A single SHORT-ACTING nicotine replacement product used ALONE is the least effective of these options. Short-acting forms used on their own increase quit rates by roughly one and a half times over placebo, and their success depends heavily on the patient dosing frequently enough through the day — which most patients do not do.

Note: If that was the intended key, the recall is wrong. Note also that the FDA REMOVED varenicline's boxed neuropsychiatric warning in 2016 after the EAGLES trial. The dentist's role is the 5 A's, and ASK is the first step at every single visit — brief advice from a clinician measurably increases quit rates on its own.