Glass straws can be dangerous if they crack, shatter, or are used incorrectly, but when they are well‑made borosilicate glass and used with basic precautions, the overall risk is considered low for most adults. They do not leach chemicals like some plastics, but there are still concerns about breakage, injury, and possible chemical contamination from manufacturing.

Quick Scoop

  • Main risk: Cuts in the mouth, chipped teeth, or swallowing glass if a straw cracks or shatters while you drink, especially with very hot drinks, pressure from carbonated beverages, or if someone chews on the straw.
  • Health‑wise, glass is inert and does not leach BPA or microplastics, which makes it appealing compared with plastic and some paper straws.
  • Some testing has found low levels of PFAS (“forever chemicals”) in certain glass and other eco‑straws, likely from raw materials, but levels are generally low and occasional use is unlikely to cause immediate harm, with concerns focused on long‑term accumulation.

What Can Go Wrong?

  • Breakage: Even tough borosilicate glass can break if dropped, bitten, or exposed to sudden extreme temperature changes, and broken pieces can cut the lips, tongue, or throat or be accidentally swallowed.
  • Burns and cracking: Using glass straws in boiling‑hot drinks or highly pressurized carbonated beverages increases the chance of cracking or sudden failure.
  • Kids’ safety: Because of hardness and breakage risk, glass straws are usually not recommended for very young children; softer materials like silicone are suggested instead.

Are They “Safer” Than Other Straws?

  • Compared with plastic, glass straws avoid BPA, phthalates, and microplastic shedding and are reusable for years, which is a plus for both health and the environment.
  • Compared with metal, emergency‑department data suggest metal straws cause more serious injuries than other straw types, particularly in children, so they are often considered the riskiest “eco‑straw” option.
  • Compared with paper and bamboo, some alternative straws (including glass, bamboo, and paper) have been found to contain PFAS, but concentrations are generally low; the main issue is potential long‑term accumulation in the body and environment.

How To Use Glass Straws More Safely

  • Choose thicker borosilicate glass from reputable brands, and inspect the straw regularly for hairline cracks or chips; discard damaged straws immediately.
  • Avoid chewing or biting the straw, avoid boiling‑hot liquids and high‑pressure fizzy drinks, and supervise older kids closely if they use glass straws at all.
  • For anyone with seizures, poor coordination, or high fall risk, consider softer options (like silicone) to reduce the chance of facial or mouth injury if there is a slip while drinking.

Information gathered from public forums or data available on the internet and portrayed here.