An Unhealthy pH Level. Tooth decay can occur when the pH level in the mouth is 5.5. For reference, the neutral level is 7.0. When we consume acidic foods and drinks, the pH within the mouth decreases and can cause the pH in the dental plaque to fall rapidly below 5.0.
Plastic Golden Age Passports are valid for a lifetime. However, if you do want the new Senior Pass, you may purchase one for $10, with proof of identification (e.g., driver's license, birth certificate, or similar government-issued document).lastic Golden Age Passports are valid for a lifetime. However, if you do want the new Senior Pass, you may purchase one for $10, with proof of identification (e.g., driver's license, birth certificate, or similar government-issued document).
Adult Card Validity. Any United States citizen over the age of 16 can apply for an adult passport card. Like passport books, adult passport cards remain valid for 10 years from the date of issue. The date your passport card was issued is printed on the front of the card along with the expiry date, making it easy to check how much validity is left. Childrenâs passport cards are only valid for five years.