Suit Leads to Warning Signs at Dentist Offices

The California Dental Assn. and an environmental group are expected to sign an agreement today in San Francisco Superior Court requiring dentists statewide to post new warning signs in their offices by early next year alerting patients that they may be exposed to mercury and cancer-causing chemicals.

As You Sow, a San Francisco environmental group, brought the lawsuit against the 18,000-member association under Proposition 65, an initiative that requires businesses and employers to post warnings if their activities might expose customers or employees to substances that are known to harm health.