Just because a painkiller is available aver the counter (otc) it doesn't mean it's harmless, especially if it's paracetamol/acetaminophen/Calpol/Tylenol/Panadol. See this abcnews article. And see this Google search page.This drug is particularly dangerous to children. See Philly.com Report. For children especially it can cause asthma, liver damage and even sudden death. - That's apart from starting them on the path of painkiller dependence and painkiller addiction.
It is better
to deal with the cause of the pain, rather than trying to eliminate the symptom.
Pain is not caused by paracetamol deficiency.