Please choose the correct ending to complete the given sentence: Health: [header] How to avoid dental crown problems [title] Check the color. [step] Before getting the permanent crown inserted, your dentist will carefully match the color of the crown to the color of your teeth to ensure it looks natural. He or she should consult you, giving you a chance to approve or disapprove of the selection.

Ending1: [substeps] Tooth crowns come in different color shades, so you should choose a color which contrasts with your teeth as much as possible. Wearing crowns that both complement and contrast poorly will cause a health problem. Ending2: Using a mirror, look in your mouth at the surrounding teeth to see if they are the same hue as the crown. Don't be afraid to reject your dentist's initial selection. Ending3: [substeps] When looking up pictures from your past appointments, make sure to read the descriptions carefully to make sure the adhesion is painless. [title] Consider modern or semi-permanent crowns if your teeth are worn in a half-moon shape. Ending4: [substeps] Your dentist may ask you what color will look best on your teeth and gums before you get the crown inserted. [title] Tell your dentist that you would like to get two crowns.

Answer format: ending1/ending2/ending3/ending4