Ignoring that, IMO, very few people would use it, and that the dentist may have other things to attend to than the patient’s smalltalk, there’s the issue of hav

Ignoring that, IMO, very few people would use it, and that the dentist may have other things to attend to than the patient’s smalltalk, there’s the issue of having to clean it between patients. That would probably mean having a keyboard with a cover that one cannot easily blind-type on, further decreasing the number of people who would use it.