The mechanism of action for improvement is probably related to the presence of an obstacle to picking. This obstacle must alter habitual behavior in a way that can be maintained after discontinuation of therapy, as happened with patient 1. The presence of an artificial cuticle may benefit the patient by providing a barrier from other external factors, such as microbiologic or chemical insults. Further investigation to confirm these results would include a contralateral control comparison (ie, 1 treatment nail and 1 control nail). Additionally, identifying patients with classic median nail dystrophy of Heller (without the habit-tic component) may prove further the usefulness of this inexpensive therapy. This therapy has been and is being used in several other patients of mine, with predictable success. One noteworthy caution that must be discussed with patients is the possibility of developing an allergic contact dermatitis reaction to the acrylate components,9 which may require the abandonment of this type of therapy for other historically suggested alternatives. This brief case series is presented to demonstrate a successful treatment of habit-tic deformity of the thumbnails with (1) low risk, (2) high cosmetic acceptability, (3) predictably maintainable results, and (4) negligible costs. It is limited by the small cohort number, the lack of control of the product used, and the method and frequency of product application. Since the completion of the reporting period, 10 other patients, including 3 women, have been identified and are following similar protocols with success.