7 children hospitalized after routine dental procedure

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(KTLA) -- An investigation is underway by the Orange County Health Care Agency after several children were hospitalized with serious bacterial infections following a common dental procedure.

The children were seen at Children's Dental Group of Anaheim, located at 2156 E. Lincoln Ave., between May 3 and Aug. 2 for pulpotomies, or "baby root canals," and later developed serious bacterial infections. County health officials said eight children have been reported to have slowly progressive oral cellulitis, a bacterial infection of the mouth that can spread to the gum and bone.

Seven children have been hospitalized at Children's Hospital Orange County, and officials were working to contact the parents of 500 more children who were also seen at the Anaheim dental clinic.

See photos from the incident:

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Kids hospitalized after going to the dentist
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Kids hospitalized after going to the dentist
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"The number of patients affected has been a very small percentage of those who have received pulpotomy treatment at our Anaheim office," Samuel Gruenbaum, the dental group's CEO, said in a released statement. "Our thoughts, as well as our actions, are devoted to the health of our patients as we work through this situation."

The dental group stopped doing the procedure last week, the Orange County Health Care Agency reported, but the source of the infection was not yet confirmed.

Dental staff was reaching out to all parents of the children who had the procedure done and offering x-rays and examinations to check for infection.

Symptoms to watch for are tooth pain or swelling, and tenderness of the gum, neck, or jaw.

Treatment for the infection includes intravenous antibiotics, or may require surgery, officials said.

Related: Learn more about common dental issues and procedures:

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Common dental problems and procedures

Cavities are caused by tooth decay and are generally treated with a dental filling. 

(Photo by Kourosh Behbahani via Getty Images)

Abscessed teeth occur when the root of the tooth becomes infected, causing the area to swell. 

Symptoms can include fever, pain, redness and bad breath. 

(Photo via Getty Images)

Gingivitis is a gum disease caused by inflammation. 

Symptoms include bad breath, bleeding gums, and receding gums. The disease can be treated in its early stages with proper brushing and flossing. 

(Photo via Getty Images)

Dental crowns are put in place over damaged or worn-down teeth to protect them or improve their looks. 

(Photo by Jonathan Knowles via Getty Images)

Bad breath can be caused by poor diet, or other medical conditions like gingivitis or dry mouth. 

(Photo by Bartomeu Amengual via Getty Images)

Wisdom teeth, which are the final teeth to grow in adults, may crowd other teeth or cause other problems and need to be removed. 

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Dry sockets occur after a tooth is removed, and the wound is unable to clot. 

Symptoms include pain, visible bone rather than a clot, ear pain, bad breath and a bad taste in the mouth. 

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Root canals are done to remove tooth decay or to repair a damaged tooth. They are more invasive than dental fillings because the pulp of the tooth and the nerve are removed. 

(Photo by Michelle Del Guercio via Getty Images)

Oral cancer can present as a red or white lump or patch on the inside of the mouth. 

(Photo via Getty Images)

Tooth sensitivity is caused when tooth nerves are irritated by substances that are hot, cold, sweet or acidic. 

Sensitivity can be treated with certain toothpastes or gels but may signify an underlying issue. 

(Photo by Jamie Grill via Getty Images)

Dry mouth occurs when not enough saliva is being produced. It is a side effect of several medications and diseases, including diabetes and HIV. 

(Photo by Isabelle Rozenbaum via Getty Images)

Dental implants can be placed where teeth are missing, either due to trauma or removal. 

(Photo via Getty Images)

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