Embodiments are disclosed for a method for restoring a wearable biological sensor. The method includes determining that a wearable biological marker sensor comprising a reference electrode is placed within a restoration apparatus. The restoration apparatus includes a correct reference electrode, a counter electrode, and a chloride solution. The reference electrode is in electrical contact with the correct reference electrode and the counter electrode through the chloride solution. The method additionally includes determining whether the reference electrode is degraded based on a voltage differential between the reference electrode and the correct reference electrode. The method also includes restoring the reference electrode, if the reference electrode is degraded, by applying a voltage to a circuit. The circuit includes the reference electrode and the counter electrode. Further, multiple chloride ions of the chloride solution bond with a plurality of silver atoms of the reference electrode.