Yes, white kitchen cabinets can turn yellow over time if they aren't properly maintained, especially if they are exposed to a lot of bright sunlight. But it's not a given. You can protect your white cabinets by preventing direct sunlight, especially in the late afternoon, by drawing the shades or closing the windows.  Regularly cleaning your cabinets is important because you might not realize it, but every time you cook, tiny bits of grease are sent through the air, and these grease particles land just about everywhere, including your cabinets. Over time the buildup of grease particles can turn your white cabinets yellow. I recommend keeping some handy cleaning wipes inside your kitchen cabinets so that you can use them or a natural cleaning spray on a daily basis. To be clear, this problem associated with grease flying through your kitchen will happen no matter what type of cabinet you have. Realistically, you should be cleaning your cabinets regularly, so don't let the thought of extra maintenance distract you from the best white cabinet ideas.