When low B12 is responsible, however, the smooth texture of the surface of the tongue tends to be due to changes in the size and shape of the papillae – the small bumps that help the muscle grip food.
Generally speaking, a healthy tongue should be pink and evenly textured throughout.
In fact, one of the first noticeable symptoms of an unhealthy tongue is a drastic change in the colour from its normal shade.
Apart from pain, other signs of concern may include unusual lumps and bumps, as well as ulcers.
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