The retention crisis is affecting students experiences.
The TUI says students will miss out on their favourite subjects this year due to the teacher recruitment and retention crisis.
It will issue a briefing document to politicians this week outlining the shortages impacting the sector.
A recent survey by the union found 78% of teachers who started before 2015 say they couldn't afford to take up the profession now.
TUI General Secretary, Tullamore's Michael Gillespie says our best teachers are going abroad because they can't see a future here:
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