I have been thinking about this a lot like for the last 7 years. So, I have been suffering from cavities when I was like 12 and my parents decided to send me to the dentist and they advised me to avoid eating sweets and brush my teeth 3 or 2 times a day I follow the dentist advised till now. Since then I avoid eating anything like any foods because I fear I might get cavities again I only eat a little everyday until now. Every time I eat I always think about the cavities or some acid is slowly eating my teeth away. And I get skinny and my height stop growing and I did not even realize it till it was weight checking in our school and my classmates keep saying I am very skinny and look like a skeleton. I still think about my teeth every night. 

I cannot also afford to tell my parents about this and my siblings because I do not want to be such a burden and to be treated weirdly. My parents would give us money and told me to buy my favorite food I just smile and spend the money on some things but not food. 

My siblings did not suffer from any kinds of dental problems so they are fine even if they forgot to brush their teeth for a week or something.

well maybe when I graduate in college I will get to fix my teeth with my own money without them knowing. Don't be mistaken, my parents are kind but I don't want them to worry abt me