Taking to her Instagram Story to share a picture of the three teeth seemingly placed on a kitchen worktop, she asked: "Not that I'm sentimental but... U think I can throw your baby teeth away @brooklynpeltzbeckham?? (sic)"
The former Spice Girl had previously asked her son: "Found this old baby tooth. Do you want it back Brooklyn?" And he replied: "No thank you haha."
Posh Spice - who also has daughter Harper, 12, and sons Romeo, 21, and Cruz, 19, with the sports star - has a "whole bucket" of her offspring's teeth and has in the past asked for advice on what she should do with them.
She previously shared: "Okay, so Harper Seven's tooth fell out last night. She left her tooth by her bed and, look, the tooth fairy came.
"[She] left her a little note. Well, she left her a few little notes, to tell Harper she's funny, sensitive, smart, generous, kind, a great daughter, she's loving, a great sister, and I've got another tooth to add to my collection.
So, I have a question. What do all the mummies and daddies do with all the collected teeth?
"I've got an entire bucket with all the collected teeth!"
Meanwhile, Victoria recently admitted her body insecurities stopped her from sitting on the beach watching her children play.
The mother-of-four opened up about her difficulty feeling free in herself while they were growing up in a chat in which she also detailed her "disciplined" diet.
She told Grazia magazine: "I've had so much said about me and I'm sure that has robbed me of some experiences.
"I never want to look like I'm complaining, but there were times in the past that I haven't felt confident enough to sit on a beach and watch my children play.
"I remember after I had Brooklyn, my first outing was on the front page of the newspaper, with arrows pointing to where I needed to lose weight.
"Those things can affect how you feel and conduct yourself in public. Now, if paparazzi want to take a picture and say something - too bad, it doesn't bother me in the same way."
Victoria now feels more stable, insisting negative comments about her appearance "don't bother her now".
She said: "This is how I look. I'm going to make the best of it, work hard at it. "I'm very disciplined with the way that I eat, the way that I work out and the way I work. That's just who I am.
"But I do like to have a drink and I'm not going to be one these, 'Ah, there are too many calories in a glass of wine' types. Whatever.
"Life's too short. Let's have a nice time."
David famously revealed Victoria has eaten the same dish of grilled fish and steamed vegetables for 25 years, saying she will "rarely deviate" from the meal.
Celebrity news
Victoria Beckham has a 'whole bucket' of her children's baby teeth
Victoria Beckham is still holding onto eldest son Brooklyn's baby teeth. The 50-year-old fashion designer has been trying to get her 25-year-old son, whom she has with retired soccer ace spouse David Beckham, 49, to take them off her hands - but he's not interested
