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Early Life Microplastic Exposure Impairs Mouse Incisor Enamel Formation
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A new mouse study found that when pregnant mice and their babies were exposed to tiny plastic particles (microplastics) at low doses, the offspring's teeth didn't develop normally, their teeth came in later and had weaker, less mineralized enamel. Interestingly, the smallest plastic particles (1 micrometer, about the width of a bacterium) caused the most damage, suggesting tiny plastic fragments may be especially good at disrupting how enamel-forming cells work. While this is animal research and doesn't prove the same thing happens in people, it raises concern that early-life microplastic exposure could affect children's too
Microplastics (MPs) are pervasive environmental contaminants with growing evidence of systemic toxicity; however, their effects on tooth development during early life remain poorly understood. In the present study, we investigated whether early-life exposure to polystyrene microplastics (PS-MPs) affects tooth eruption, root formation, and enamel development in mice. Pregnant mice were administered 1, 4, and 10 μm PS-MPs (10 μg/kg/day) from gestation through lactation, and offspring continued exposure post-weaning. Mandibles were analyzed at postnatal days 14, 25, and 42 using micro-computed tomography, histology, scanning electron microscopy, and microhardness testing. Early-life MP exposure did not affect maternal outcomes or overall offspring growth. However, it significantly delayed molar eruption and root formation and produced incisor enamel defects, including reduced enamel length and volume, decreased mineral density, and decreased mechanical hardness. These effects exhibited particle size dependency, with 1 μm MPs causing the most significant changes. Histological analyses revealed increased proliferation of transit-amplifying cells in the labial cervical loop and postponed ameloblastic differentiation, accompanied by an incisal shift in enamel matrix deposition. Collectively, these findings demonstrate that early-life MP exposure disrupts tooth development in a size-dependent manner and identify developing dental tissues as sensitive targets of environmental MP exposure.
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Ultrasonographic and Morphometric Characterization of Embryonic Development Following Maternal Exposure to Polystyrene Microplastics
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When pregnant rats were fed tiny plastic particles (like those found in bottled water and packaged food), their babies grew normally at first but showed slower growth later in pregnancy and after birth. Smaller plastic particles (1 micrometer) caused more noticeable effects than slightly larger ones (5 micrometers), suggesting the tiniest plastic bits may be more harmful to development. While this study was done in rats, not humans, it raises real questions about whether the microplastics we're all exposed to daily could affect pregnancy and infant growth.
Effects of Micro- and Nanoplastics on Human Saliva– and Dental Plaque–Derived Biofilms
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Scientists exposed spit and dental plaque samples to tiny plastic particles (microplastics and nanoplastics) in the lab and found they changed the mix of bacteria living in your mouth, sometimes boosting acid-producing germs linked to cavities. The effects depended on particle size and amount, and while this doesn't prove microplastics cause dental problems in real life, it raises questions worth studying further.
Lactating exposure to microplastics at the dose of infants ingested during artificial feeding induced reproductive toxicity in female mice and their offspring
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When nursing mice were exposed to microplastics at levels matching what infants ingest from plastic baby bottles, the mothers developed reproductive problems including delayed puberty, irregular cycles, and reduced fertility. Strikingly, their male offspring also showed decreased sperm count and quality, even though they were only exposed through breast milk. This suggests microplastics can cause reproductive harm that passes from mother to child, with males being especially vulnerable.
[Effects of microplastics exposure in development of mineralized tissues].
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This review examined evidence that microplastic exposure affects the formation and development of mineralized tissues including bone and teeth, finding that MP-induced oxidative stress and inflammation may disrupt mineralization processes and raise concern for skeletal health from environmental plastic exposure.
Epigenetic Remodeling of Pharyngeal Arch Derivatives: Analyzing the Impact of Maternal Microplastic Exposure on Craniofacial Morphogenesis
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In a rat study, pregnant rats given water with microplastics passed those particles on to their developing babies, and higher doses led to more jaw, palate, and ear-bone birth defects. The likely cause: microplastics seemed to chemically "silence" key genes that guide facial development by altering how DNA is packaged, not just by physically blocking growth. While this is animal research and can't yet be directly applied to people, it raises real concerns about how everyday plastic exposure during pregnancy might affect a developing baby's face and skull.
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