The job of a dentist cleaning teeth only seems dangerous in this case. A moray eel will never offend its Cleaner Wrasse. Cleaner Wrasse eats the parasites in Giant Moray mouth.
Small Gubal Island (Egypt Red Sea) is interesting for its dense fish population. You can meet up to a dozen giant moray eels of decent size during a dive. Someone has to eat all that fish soup! The marine life here is truly amazing. But diving is often affected by strong currents. Especially after the new moon.
Labroides dimidiatus, Common Cleanerfish
Gymnothorax javanicus Giant Moray
More information about the fish of the Red Sea in the new book: Red Sea Marine Life (Amazon paperback)
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