Amber teething necklaces are marketed with a specific claim: that body heat causes the Baltic amber to release succinic acid, which is then absorbed through the baby's skin and provides anti-inflammatory and analgesic (pain-relieving) effects. This sounds plausible enough that millions of parents have bought them. But every step of this chain falls apart under scrutiny.
Amber does not release succinic acid at body temperature. Amber is fossilized tree resin that is millions of years old and chemically stable. To decompose amber and release its constituent compounds requires temperatures far above what the human body produces. At 37°C (body temperature), amber does nothing.
Even if it did, succinic acid is not a meaningful anti-inflammatory at trace levels. Succinic acid is a normal metabolic intermediate — your baby's own cells already produce it as part of cellular energy metabolism. The amount that could theoretically be released from a tiny amber bead through skin contact is negligible compared to what the body already manufactures.
No study has ever shown amber necklaces reduce teething symptoms. There are no randomized controlled trials, no blinded studies, no credible research of any kind demonstrating efficacy. The evidence consists entirely of parent testimonials, which are subject to placebo effect and confirmation bias.
What there IS evidence for is harm. Strangulation incidents. Choking on beads. Emergency room visits. These are documented, not theoretical.