Not sure if the anesthetics have got better or if it's just a skill issue, injecting it in precisely the right place? I had problems way back in the 90s with t

Not sure if the anesthetics have got better or if it's just a skill issue, injecting it in precisely the right place? I had problems way back in the 90s with them not working too well on me. But my current dentist gets it perfect every time - properly numb very fast, but remaining fairly localised.