Puberty

The hormonal surge that occurs during puberty can cause more than acne—it can also result in swollen gums that are more sensitive to plaque. This can lead to gum infections, gingivitis, and mouth sores, say Halpern.

"But typically the gums only respond in such a manner if hygiene care is poor," he adds. Make sure your teen brushes and flosses daily, and sees a dentist regularly.

Above article from:  Health.com

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