My 15 month old does not want to brush her teeth!

My son went through something similar around that age. One day brushing teeth was fun, and the next day he acted like I was torturing him. 😅 Sometimes I wonder if it's teething-related or just them realizing they can have opinions about everything. We just kept brushing, even if it wasn't perfect. Some days I had to sing songs, let him hold a second toothbrush, or make silly faces to get through it. Now that he's older, if he's had something sweet, I sometimes show him little videos about "germs" on teeth and remind him during brushing that we need to get all the germs out. 😂 Obviously your little one is still a bit young for that, but it worked surprisingly well for mine when he got older. Everything is a phase with them!

Since this sudden shift happened just a few days ago, try checking if anything is physically hurting her. At 15 months, she could be cutting her molars or canines, or she might have a small mouth ulcer that makes the bristles feel painful on her gums. Try gently feeling around her mouth when she's calm, or gently ask and have her point to see if her teeth or gums are hurting. If it's a teething flare-up, switching to a cool washcloth or a softer finger brush for a couple of days might help ease her back into it.