Teeth issues. I had very bad oral hygiene in my early years so at about age 15 I went to a dentist and had a complete evaluation. After reviewing all the issues he asked me if I wanted to have all my teeth pulled and go with dentures or start a program to correct everything. I was shocked!
We designed a program where I came in once a week for about 2 months and each visit would be to work on one specific area of concern. I had no insurance and during summers worked on a golf course for $1.35 / hour so I paid on a schedule.
Since then I have paid close attention with brushing, flossing and cleanings but after 50+ years even his best efforts have had to be repaired and in some cases I have had to go with implants which were expensive but well worth it.
Prolly have enough invested in my teeth to buy a Tesla or two.