Do chemicals in bonding pose a real danger?

I need to get some bonding done to one of my upper molars.  After I took off my braces a few years ago, a part of the tooth came off and left a space between the molars.  I keep getting food stuck back there and need to remove it with floss.  

There's a sign in my dentist's office that they use materials in fillings that are "known to the state of California to cause cancer and reproductive harm".

What exactly does this mean?  What exactly is the danger?  Should I not get this bonding done to avoid the dangers?  

[Matthew Baron, D.M.D.]

Ask your dentist what that sign means.  To my knowledge, the bonding materials used pose no threat to your health.  Unless they were talking about the metal amalgam material.

[mike1105]

ask your dentist what materials his sign is referring to.