As for the effect thumbsucking had on adult dentition, roughly one fourth of respondants had either crooked or bucked teeth, with bucked teeth comprising the result in two third of those so affected. This is in agreement with the generally accepted idea that the effect thumbsucking has on the teeth is a function of sucking technique and force, even more than duration. Perhaps after obtaining more respondants for this index, we may come to a different conclusion. Only approximately one fourth of the respondants had calluses, a surprising finding, at least to me. The thumbsucker's callus occurs as a direct result of pressure from the lower dentition directly onto the thumb.
Technique is very important here also.
Almost half the respondants suck their left thumb, with a slight, though significant,decrease in the number of right thumb thumb suckers. The predominant associated comfort behavior is placing the finger over the nose. This, of course, makes sense since it allows for a deeper thumb position and a more comfortablesucking experience. It's possible that the blanket behavior allows for the ability to effectively hide the habit from unexpected discovery. Perhaps, also, the blanket closes off the outside world, in a ritualistic fashion.