The person I bought this for may have a very massive head (cave skull) but was quite small. So small that we didn't even cook and adjust them. I just don't think they would give enough - even after a boil - to fit in his jaw. But it's always good to have one just in case, so I don't mind having it on hand for a few bucks. It actually fitted my mouth perfectly, so who knows. One day I might need it. For someone with a smaller jaw, that would be fine. It has a fairly soft cushion and seems easy enough to cut and shape to get the perfect fit.
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