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).
1. Who can apply. You must have British nationality to be eligible for a British passport. An adult passport is valid for 10 years. Apply for a first adult passport if youâre aged 16 or over (or will be within 3 weeks) and never had a child passport. If youâve already had a child passport and it has run out, follow the process for renewing your passport in the UK or outside the UK.