All students are encouraged to take tuition in their mother tongue; this supports their overall literacy, cognitive success, and leads to better long term academic achievement.
Rather I believe there should be some real genuine reasons to use mother tongue.
I am sure that the students' mother tongue is a supporting factor in language practice classes or in teaching a particular subject
Whether students' mother tongue should be used and to what extent while teaching a second language, I think, depends on many factors.
There are many ways of building students confidence . If the teacher is really good sooner or later the the students would understand that he or she can always rely on you. The teacher should make the students understand in the beginning it self that the classroom is like a lab where everybody can make mistakes and the teacher is always there to support and clear their doubts.
The use of the students mother tongue has the following positive effects:
1. It can be used as an ice breaker to bring students into the fold
2. It can be used to build confidence in the students to talk
3. The student is confident that he/she can depend on you if there's anything that he/she does not understand
4. It makes the student feel comfortable and he/she knows that you will understand
5. The student feels assured that you will not laugh at him/her when he/she makes mistakes
The use of the mother tongue will be more during the beginners or elementary stage. However as the student progresses on to the lower intermediate level the use of the mother tongue should be reduced and dropped completely by the intermediate and upper intermediate level.