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What is sinus? Sinuses are present in our face. There are total four types of sinuses. 1. Frontal sinus 2. Ethemoidal sinus 3. Sphenoidal sinus 4. Maxillary sinus Sinusitis means the inflammation of sinus cavities. The function of sinus is to maintain body temperature and strengthens the facial bone. Due to infection and inflammation in the sinus cavities the air is not humidified and warmed ...