When do you start bringing your toddler for dentist visit? Where can we bring them to dentist visit?

I brought them to dentist when they are 3yrs old, cause my girl front tooth was alittle black so scare it is decay. Luckily it was dirt. The dentist I went is the normal dentist that I go, thankfully she also see children. She uses a solution to numb the gums so it wasn't painful for them. They didn't cry or scream but then again I was carrying them so more comforting. For adult she also uses the solution cause my gums hurt a lot when she starts cleaning. Thank god for the solution.