Totally giving up 😞😩

My 16 month old won’t let me brush his teeth 😩 I’ve tried everything! In the bath, while he plays, together, giving it to him to do it himself but instead he plays with the toothbrush or throws it idk what to do anymore? Any suggestions? It’s been a few days without brushing his teeth and I feel like a bad mother but I kept trying and at this point I gave up.