Context: So today I went to a new dentist for a checkup and cleaning . It 's been about 2 years since I last went to one , so they had to prod all around in my mouth finding out what " previous work " I had done . Now I ' ve never really thought much of dentistry beyond the idea that it 's like grease monkey for your mouth ; you just need to stop in every 20k miles or so . But today as this gal explored every tooth , filling and whatnot , she kept saying " Oh my , what great work ! "

Question: What may be the reason to go to the dentist ?
Options:
0. To keep my feet healthy
1. To keep my heart healthy
2. None of the above choices .
3. To keep my eyes healthy
Answer: 2