Here's an example both via dental photography and via full face shots of what one can look forward to as the dentition adapts to long hours sucking the right thumb. Of course it also depends on style. Notice the open bite favoring the right side. This occlusion is unusual due to the lack of an open bite. Apparently the pressure was mostly forward with most of the upward push on the roof of the palette, none on the dental structure itself.
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What you get with two fingers instead. More Teeth 1 E-Mail for contributions by clicking here. Cook measured the forces of thumb-sucking, finding three distinctly different patterns of force application during sucking all utilizing forces sufficiently strong to displace teeth or deform growing bone. It should be remembered that the type of malocclusion that may develop in the thumb sucker is dependent on a number of variables, the position of the digit, associated orofacial muscle contractions, the position of the mandible during sucking, the facial skeletal pattern of the force applied to the teeth and alveolar process, the frequency and duration of sucking and so forth. An anterior open bite is the most frequent malocclusion.