Bleeding gums are a common issue and you can experience this while brushing teeth or biting a hard and juicy apple. Gums that bleed are giving you signs of gingivitis or gum disease. This issue can be easily prevented with good oral hygiene. Brushing and flossing can also treat mild cases. https://thebigblogs.com/blogs/the-10-most-common-dental-problems-and-how-to-treat-them/