An optical blind-guide apparatus for detecting an object is provided. The proposed innovation provides a fitting pad having two detection points. The cover additionally includes a pair of flanges adjacent the building that permit the cover to conform to irregular building surfaces while also increasing the strength of the cover. Furthermore, user’s setting information recorded in the memory device is erased while returning setting contents of the various functions to default states. Oral hygiene devices disclosed herein achieve improved plaque and stain removal from the teeth as well as interproximal and subgingival regions, while enhancing the user experience, massaging the gums, stimulating dental tissue, and disrupting biofilm.