Salivary calculus or sialolithiasis is a disease that affects the salivary glands characterized by the formation of mineralized structures within the glandular substance or excretory ducts of the salivary gland. The formation of these salivary stones is due to the crystallization of minerals in saliva. It causes blockage of salivary ducts and results in painful inflammation or sialadenitis of the salivary gland. Among the salivary glands submandibular gland has highest incidence of sialolithiasis due its anatomic features. The patient commonly experiences pain and/or edema when the ducts are obstructed. The case report presented here is of sialolithiasis of submandibular gland which had caused pain and swelling in the floor of the mouth.