Why won't my boyfriend won't whiten his teeth?

KDizzle1108
I have asked my bf to whiten his teeth twice (A very hard thing to bring up). Both times, I gave his whitening strips. His teeth are so yellowed. He said other people told him that he has yellow teeth, too. I don't understand why he won't do it. If someone told me that, I would whiten right away.
Why won't my boyfriend won't whiten his teeth?
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