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).
A passport's validity is generally determined by the applicant's age. In the US, passports issued for adults ages 16 and older are valid for 10 years. Children 15 years of age and under receive passports valid for 5 years. There are two primary exceptions to this rule: a second passport is valid for 2 years and an emergency passport is valid for 1 year. In some instances, when replacing a lost passport, for example, the Department of State may issue a passport with lesser validity (usually 1 or 2 years).