Tooth Trouble is a term used to describe dental issues that can cause pain and discomfort. The crossword solutions for this term are ACHE (4 letters), DECAY (5 letters), and ABSCESS (7 letters). ACHE is a general term for pain, usually caused by inflammation or injury. DECAY is the process of a tooth breaking down due to bacteria or acid. An ABSCESS is an infection in the gums or around the root of a tooth, which can cause swelling and pain.