I don't see it as personal grooming, rather self-care.
15 minutes a day, shower, body scrub, body cream, teeth, face, cleanse, serum. sun-screen. Night routine is 5 mins. Teeth and face.
Hair I was one a week and do a mask in the bath, put a face mask on at the same time.
Once a fortnight beautician for mani-ped, eyebrow and lower leg wax. That's it!
It doesn't take that long. 20 mins a day, 1 hour bath weekly and 1.5 hours a fortnight with my beautician.
17 hours a month!
Hygienist every 12 weeks and dentist every 6 months.
I do think it's important to like yourself and deem yourself worthy of care.
And motherhood isn't a state of sumsumation. I tell my children that it's really important to centre yourself in your own life. You are important, you matter, you are absolutely at the centre of your own existence.
If you care for yourself first, you can then care for others from a very healthy place. Which makes giving easy, you have the mental space to do that.
It sounds as though you weren't taught to do that @AdamAntlers. If you've got the cash, therapy would be very helpful. If not, just take 10 minutes a day, find a routine of self-care, look after and value yourself.
Teeth, face, body, hair, mind.