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The tongue papillae, including the taste buds, can become inflamed. A sore tongue is not always a sign of something more serious. The tongue should be included in good dental health habits. Over time, smoking can make the tongue more sensitive to heat and cold.
That is quite untrue. Conductance in the mouth is better than skin. Tongue is very sensitive for heat and we feel it is hot when reaching 43Â°C and we can support more for hands (near 60Â°C). BTW, this sensitivity decreases in oesophagus and it is why it may be hot in mouth but no more after (but danger remains...)