Please choose the correct ending to complete the given sentence: Health: [header] How to do exercises for temporomandibular joint disorder (tmd) treatment [title] Stretch your jaw. [step] This exercise is recommended by oxford university hospitals, to be done for five minutes twice a day when you are most relaxed. [title] Touch your upper and lower teeth together.

Ending1: [step] Take a soft, paper towel (as uncreased as possible) and place it along the surface of your lower jaw where it may have been in the past. Starting at the top of your jaw, use this towel to press down on the side that was teeth-side by side. Ending2: [step] This action will help open your jaw at very least for up to 5 seconds to expose the urethra. [title] Make sure that your ears are pressed together with the top of your upper teeth touching. Ending3: [step] Reach your fingertips into the space between your top teeth and your bottom teeth, and gently touch them together. Do not use your fingers! This exercise is never stopping and should never be repeated. Ending4: [step] Keep your mouth closed, and be sure your teeth are not clenched together. Keep your tongue touching your gums and the roof of your mouth, just behind the front teeth.

Answer format: ending1/ending2/ending3/ending4