Scientist uses stem cells derived from dental pulp to return hearing to deaf people
http://www.news-medical.net/news/20...l-pulp-to-return-hearing-to-deaf-people.aspx?
http://www.news-medical.net/news/20...l-pulp-to-return-hearing-to-deaf-people.aspx?
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Many case studies are available which prove their safety; their efficacy, type and delivery method is what is currently up for date though.