Please choose the correct ending to complete the given sentence: Health: [header] How to strengthen your nails [title] Trim your nails regularly. [step] If you let your nails grow too long and get jagged and rough, they are more likely to break off and get weaker. Your nails are kind of like your hair-without regular upkeep, they start to get weaker at the tips.

Ending1: As you see, sticking to a simple amount of cutting and filing will ensure you don't have to clip or file your nails every two days. [substeps] Aim to get at least 1 inch (2.5 cm) off your nail every five days. Ending2: This can lead to the uneven ends and edges of your nails falling out. [substeps] Cut your nails to a normal length and clip them at regular intervals into the shape you desire. Ending3: Trimming your nails regularly is one important way to help them stay strong. [substeps] Trim your nails with a nail clipper or nail scissors-not a regular pair of scissors or any other type of trimming instrument. Ending4: [substeps] If you want to be more conservative in all areas of your body, trim your nails once a week at least. Clip shorter nails every other day, especially on the sides.

Answer format: ending1/ending2/ending3/ending4