Once every two weeks is unlikely to cause any major upsets, except in the cases where children react to the colourant in the lollipop. For example,some children with ADHD will be fine with the green ones, but may have a severe hyper episode if given the red one.
Although no long term harm is likely (unless allergic obviously), the parents may not be too chuffed having a hyper child come home from school on occassion.
I am assuming, as a teacher, you would like to use lollipops as a reward? On a personal note, I have no problem with it but my advice would be to get parents approval if you are concerned.
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