Open mouth showing upper lip, lower lip, gums, tongue, and inside of cheek. Hard palate is front of roof of mouth. Soft palate is back of roof of mouth. Uvula is soft tissue that hangs from soft palate. Tonsil is ball of tissue on side of throat, one on each side. Retromolar trigone is tissue that joins upper and lower jaws. Closeup of underside of tongue and floor of mouth (soft tissue under tongue).