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National Institutes of Health
Your tongue helps you taste, swallow, and chew. You also use it to speak. Your tongue is made up of many muscles. The upper surface contains your taste buds.
Problems with the tongue include
These problems can have many different causes. Treatment depends on the underlying problem.
So You Want to Pierce Your Tongue?(Academy of General Dentistry)
References and abstracts from MEDLINE/PubMed (National Library of Medicine)