Should only the Target Language be used in EFL Lessons?

One of the more heavily debated issues in TEFL is whether it can ever be a good idea to use the students’ mother tongue to help explain finer points in EFL lessons. There is no doubt it can be helpful for elucidating a subtle point, but some EFL teachers think that only the target language should ever be used in the classroom. Does using the mother tongue stop us from ever developing fluency in the target language?
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