17m worried about gum recession

Ok so I know this is bad but I haven’t brushed my teeth for 5 years due to mental problems. Sometimes I brush with water and use a water pik to floss. Now recently, my mental problems are getting better and I have started to care about my oral health. I started brushing daily and floss. After flossing one day I noticed my bottom teeth have these white deposits on them. On the front teeth I just used a light press with my nail and it came right off. I haven’t touched the ones in circles. Is this a major issue to worry about? I am also going to see a dentist soon. Also I assume I have periodontitis, correct?

Ok so I know this is bad but I haven’t brushed my teeth for 5 years due to mental problems. Sometimes I brush with water and use a water pik to floss. Now recently, my mental problems are getting better and I have started to care about my oral health. I started brushing daily and floss. After flossing one day I noticed my bottom teeth have these white deposits on them. On the front teeth I just used a light press with my nail and it came right off. I haven’t touched the ones in circles. Is this a major issue to worry about? I am also going to see a dentist soon. Also I assume I have periodontitis, correct?