Some patients have a fluorotic type of enamel, and they may show 'enamel footprints' at the time of appliance removal. At the case set-up appointment etchant is normally applied only to the bracket base area. At the end of treatment, after de-bonding, there may be residual resin in the previously etched area of enamel, with an appearance which contrasts with the fluorotic enamel. This 'bracket base area' may have a better appearance than the untreated enamel. For this reason it might be considered logical to etch the entire labial surface for some patients with fluorotic enamel, at the time of case set-up. This is currently being investigated.
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