A frenulum is a piece of tissue that prevents an organ from moving. There is a frenulum that attaches your upper lip to the gums, while another connects the lower lip to the gums. A frenulum that is too short or thick, will cause problems in speech patterns and tooth misalignment. A frenectomy is a minor surgical procedure that is performed in your dentist’s office. The procedure is very successful and causes minimal discomfort.