Going to appointments with young children

This may seem like a dumb question, but how do you go to hair appointments, dentist appointments etc when you have a young kid. I need to get my haircut but I don’t have anyone to watch her during the day (I’m a SAHM). There’s no way my 12 mo old would sit on my lap still that long and if I put her down on the floor she would get into everything. Same with dentist appointments… I can’t sit in the chair and get my teeth cleaned for 40 min with her in the room. Any tips?