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After searching the best evidence in the litterature, you identify the two following articles:

– Is surgical root coverage effective for the treatment of cervical dentin hypersensitivity? A systematic review.” Douglas de Oliveira DW, Oliveira-Ferreira F, Flecha OD, Gonçalves PF. J Periodontol. 2013 Mar;84(3):295-306).
– In-office treatment for dentin hypersensitivity: a systematic review and network meta-analysis. Lin PY, Cheng YW, Chu CY, Chien KL, Lin CP, Tu YK. J Clin Periodontol. 2013 Jan;40(1):53-64.)

Please explain what is the best evidence according to the research methods used in these articles.

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