18 month old uses pacifier at night- is it that bad?

I know I should probably feel more compelled to get rid of her bink since she's still using to at night time, but it really doesn't bother me that she likes it still. She will only get it when she's sleeping, never at all during the day. They are also orthodontic binks for older babies. So my question is, should I start get take it away at night? Is it bad that she's still using it, or can I let her go for a little longer without really causing any lasting harm?