If your dentist proposes things like this, please, switch to someone else.
(For those unfamiliar, after the shots you feel not much other than some tugging. And you can get up and walk immediately after.)
[1] http://www.medicaldaily.com/baby-girl-cavity-filling-dental-...
[2] http://wgntv.com/2016/02/23/dentists-license-suspended-after...