Hello Andrew. I hope you can quickly help me. I noticed my sons upper gums today they are not a normal red pink colour and are very dark around the front only. He is 11 years old and brushes regularly.  He has a healthy balanced diet and doesn’t smoke as he is very young and I am sure of this. Could you possibly tell me what is causing this? I am very concerned.  Does he need to see the dentist every six months? His dentist is very satisfied. Thank you in advance for your time, I look forward to hearing your reply.