飛行機に電動歯ブラシを持ち込める？（米国TSA・CATSA規則）

持込可：航空保安基準において機内持ち込み手荷物として問題なく持ち込めます。

受託手荷物：受託手荷物（預け入れ）として問題なく預けることができます。

Standard carry-on baggage size allowances apply; TSA publishes no individual numerical cap for personal use.

Yes. Major brands such as Oral-B iO, Philips Sonicare must comply with standard security limits based on physical properties rather than brand labels.

Standard toiletries and liquids conforming to the 3-1-1 rule (containers under 3.4 ounces / 100 ml inside a clear quart bag) require no separate declaration. You simply place the bag in a screening bin. Medically necessary liquids exceeding 3.4 ounces must be verbally declared to checkpoint screeners before inspection.

If liquid containers exceeding 3.4 ounces (100 ml) are detected in carry-on baggage without an infant or medical exemption, screeners will not allow them past security. Travelers must surrender the item for destruction, return outside security to place it in checked luggage, or mail it home.