My 2 and a half year old has grey, dark front teeth. should i be concerned?

Yes: Dark primary front teeth could indicate they were truamatized and are dead teeth. You should go to a dentist and have the teeth checked out, although no treatment may be indicated even if they are dead or non-vital. Dark teeth indicate that there was bleeding and dried blood inside the teeth from a trauma. Have it checked out now. Do not wait.

Yes: Dark front baby teeth can be the result of several things: damage to the tooth's nerve from trauma, tooth decay, defects in how the tooth formed or simple surface staining. Some of these problems lead to early tooth loss, some are just cosmetic issues. You need to bring your child to a pediatric dentist for an evaluation so they can determine the cause and possibly find a solution.