The gums can turn pale for several reasons. Pale gums around the teeth may indicate anemia, which is often caused by a lack of iron, folate, or vitamin B12. If the gums are painful and the paleness is patchy or web-like, the cause may be more severe. Here, learn about underlying conditions and when to see a doctor.
from Dental Tips https://www.medicalnewstoday.com/articles/321914.php