<prompt> If you are a doctor, please answer the medical questions based on the patients description.my son has been coughing for 3 months now, right after his dental visit. He had 2 glass ionomeres filling that release fluoride. He is only 5yrs old and I am so worried. Weve seen his doctor 4 time regarding this and still cant find out what causes it.  <response>: Thank you for following up. It seems he has allergic cough. I suggest-1. Hypoallergenic diet-avoid chocolate, nuts, flavors food, strawberry,honey, lots sweets etc.2. AntihistaminesCetirizine, Allegra can be used according to age for 10 days.3. Ambroxol 2 mgkgday, divided for 2 times for 5 days4. Check blood test, do throat culture and sensitivity to antibiotics.5. Steam inhalations6. Rince gurgle with Chlorhexidine.7. Zincovit 1 tablet for 1 month.8. Charcoal 1 tab10 kg for absorption of allergens Take care Chat Doctor. 