My experience has been that (1) most teachers have so much less training/ awareness of LDs than you would ever imagine, and (2) parents are far better judges of when there is something different with their kid. If you think there is something wrong, trust your instincts and don't wait for the teachers to catch up. If there actually is something, the sooner you support it, the better.
Add in the ability of gifted kids to compensate and hide disabilities, and what I see again and again is kids who start to break down with anxiety in the classroom long before teachers have any clue what it is costing that child to try and keep up with their classmates every day.
