My thumb sucker is now 14yo, and still sucks constantly except when I bat her thumb away from her mouth or when she is talking to someone.
She will need YEARS of dental surgery to correct the issues caused by her thumb sucking. She needs her jaw broken and reset, and fixed braces that I can't afford!
My dummy sucker? Perfectly aligned teeth.
My own dentist tells me he advises a dummy over a thumb EVERY time. As there is the ability to take it away before Second teeth come in. You can't take someone's thumb away.
And I was THE most anti-dummy person you would ever have met when I had my DD, I could have turned myself inside out with my catsbumface seeing a pre-schooler with a dummy. I soon realised what an arse I was.
The ONLY one of mine that needs corrective dental surgery is the eldest who NEVER had a dummy.
My DS2 needed the most speech therapy of all my DC's. He was NEVER a 'sucky' baby, mostly because his muscle problems prevented him from being able to suckle at all. He was SPOONFED milk until two years old, so he never sucked his thumb, a dummy, my breast OR a bottle.
So if ANYONE had tried to tell me that his speech and language issues were to do with dummies, I might have bought a job lot of dummies and shoved them where the sun doesn't shine!!