Please choose the correct ending to complete the given sentence: Health: [header] How to fix an overbite [title] Check your teeth alignment by biting down and smiling. [step] To see if you have an overbite, let your mouth close normally, your teeth resting in their natural position. With your teeth clenched shut, smile into a mirror and look for areas where one row of teeth overlaps another.

Ending1: [substeps] If the alignment is correct, there's a good chance the alignment will be straight. To reposition your teeth correctly, take the two upper teeth and press them into their natural position. Ending2: Though some very slight overlap is normal, seek medical attention if your teeth seem severely misaligned. [substeps] Overbite is considered severe when the teeth overlap by 3.5 millimetres (0.14 in) or more. Ending3: If they don't seem to be overbites, the problem is that extra rows of teeth can form. Look in different directions to figure out where both the front and back teeth meet and how they are aligned. Ending4: You might also try rubbing your gums, or holding your breath. [substeps] If you have severe overbite, you may want to visit a dentist.

Answer format: ending1/ending2/ending3/ending4