If gingival recession exposes softened cementum, what should be done?

Using glass ionomer cement is the best choice in this scenario because it is specifically designed to adhere to dental tissues, including softened cementum that may be exposed due to gingival recession. Glass ionomer cement has properties that allow it to bond well to dentin and cementum, providing a protective layer that can help seal the exposed area and prevent further damage or sensitivity. Additionally, glass ionomer releases fluoride, which can aid in the remineralization of adjacent tooth structures and support ongoing dental health.

Other options might not provide the same level of protection or appropriate bonding. Fluoride application is beneficial for preventive measures but does not physically restore or protect the exposed cementum. Amalgam filling is not suitable since it requires a sound structure to bond effectively and can result in further issues if placed in softened cementum. Leaving the area untreated could lead to further deterioration, increased sensitivity, or potential decay, which underscores the necessity of using a restorative material like glass ionomer cement in this case.