I've just felt the wriggle again, checked and found one worm. 
I'm 45 have a 7 year old and she doesn't appear to get them. I on the other hand get them at least every 3 months.
I only find one, take Ovex and they go, do the cleaning etc but they keep coming back. I also give Ovex to DD, but she shows no symptoms.
This has gone on since I was a child, I was riddled once when I was about 12. I still remember how bad they were, it was truly grim!
So what am I doing wrong? Is it true they never really go?
Any ideas what I can do please, I follow all the normal suggestions changing bed, Hoover etc