Bruxism or grinding of teeth is unrelated to worm infestation and could occur due to a number of harmless causes. However, it might be reasonable to deworm a child of this age on yearly basis with two doses of albendazole repeated at a fortnight interval. Most of the fevers in children are due to viral causes and does not need to be treated with antibiotics. Imon contains ibuprofen and paracetamol combination and is more effective than paracetamol (calpol) and if that too is not effective, you may try mefenamic acid (Meftal P) which is better in relieving temperature.