Our six-month-old daughter loves to chew on metal spoons. She already has two teeth. Is this harmful to her teeth and dentition? Is a hard plastic spoon less harmful despite small plastic particles that can come off?
What is with the ability of harder material to scratch softer material Mohs scale. Teeth are out of Calcite (most of the teeth). Calcite has a 1.75 Mohs hardness. Steel has a Mohs hardness of 4–4.5. So for me this means if steel is chew with Calcite the Spoon must damage the teeth. But maybe this does not affect very smooth objects like spoons?
2Tooth enamel (human) ranks 5 on Mohs hardness scale, and, indeed, look at any used stainless steel utensils and you will see numerous marks left by teeth. (How many times have you seen the opposite?) That doesn't mean I would recommend a habitual gnawing on a steel bar, however. Microfractures occur over time, and popcorn is one of the major items that causes cracked teeth, along with pretzels, which are far softer than steel. :) Feb 22, 2019 at 23:43
I'm not sure I've ever seen a stainless steel utensil marked by teeth. Even really old ones my parents have had for 40+ years. The only blemish on them is a patina from age.– SmockMar 1, 2019 at 15:08
First off, the best person to ask about this for your baby is your pediatrician, as they can make sure that she doesn't have anything out of the ordinary going on in terms of dentition.
In general, teething on food-safe metal objects that are meant for the mouth is totally fine, as far as I've been able to find. Spoons, cups, etc., all went into my children's mouths on a regular basis and were well chewed. They're great for teething, especially when they start out cold - you can put it in the fridge for a minute, or in cold water, to make it even better as it reduces swelling.
I looked around, and found that dentists generally seem to consider metal spoons a good solution to teething. This article by Periodontist Todd Welch that specifically recommends cold metal spoons for teething symptoms. The same (word for word) recommendation appears on OralAnswers, which is also run by a dentist ("Tom"). Not sure which site posted it first. MouthHealthy.org, from the American Dental Association, has a similar recommendation as well.
One warning I read in several places, like this article, was that metal spoons are potentially dangerous if the child is walking around with it, because they could fall and injure their mouth. A six month old probably isn't walking yet, but they may be cruising, so you may want to keep it to high chair or other highly supervised times. I've never heard of this, nor have I seen any concrete evidence it's a risk, but it pops up in several articles.
If you're concerned about that, there are some teething-safe metal options. Don't let her chew on your keys, because they could contain lead and are likely dirty, but there are some purpose-designed metal teething object. Keynimals for example we used briefly, as an example, but any brand will do so long as it's specifically designed for babies to teeth on. Don't let her teeth on any metal object not designed to be used orally, as it may contain lead or other unsafe materials.
Finally, if you do worry about metal, my recommendation is silicone, not plastic. Silicone will not break off pieces, as plastic might as you note, as long as you pay attention to make sure nothing large breaks off. You can find freezable silicone teethers that may satisfy her need for cold contact on her gums as well or better than metal. A frozen washcloth may also feel good (wet a washcloth, put it in the freezer, then let her chew on it once it's nice and crackly).
2Nice answer, +1. "...nor have I seen any concrete evidence it's a risk..." It's real and a real risk. And posterior pharangeal lacerations (or any oral lacerations for that matter, except perhaps the tongue) are not easy to repair. Feb 20, 2019 at 21:08
1The danger factor with walking/cruising around isn't restricted to metal, or to babies/toddlers. Having anything in the mouth while walking around is potentially very dangerous. If a child does this at any age they should be appropriately corrected. Feb 25, 2019 at 8:33
Your daughter could chip her teeth on the spoon. I would recommend you try to substitute an alternative plastic spoon whenever she does this.
She might be simply enjoying the noise it makes when she bites on the metal, but I think it should be discouraged if at all possible.
"Food should be given from a hard plastic weaning spoon that will not crack. Do not use a metal spoon"
"A metal spoon may harm the baby’s mouth."
I've found a lot of forums advising against metal spoons. I've found one relatively official recommendation against metal. It's quite well known though that steel can chip teeth. I think it falls into the category of common knowledge. Feb 26, 2019 at 11:27