South Park resident Paulina Lopez said she was alarmed to find out that her 7th grade son may have been exposed to deadly viruses at his school’s dental clinic.

“What are we going to do?” she said, fearing the worst.

Seattle-King County health officials estimate some 1,250 students in Seattle and Vashon Island were potentially exposed to HIV and hepatitis through dental clinics based in 12 schools in the Puget Sound area.

The clinics were led by Neighborcare Health, a low-income healthcare provider.

In a letter, Neighborcare states that some dental equipment may not have been properly sterilized, leaving students with a chance of contracting hepatitis B, hepatitis C, and HIV.

On Wednesday, Lopez met with other parents at Concord International Elementary for a regularly scheduled meeting. There, she broke the news to some parents who hadn’t yet heard about the health scare.