1 Professionally dispensed kits from a dentist's office designed to be used at home typically cost $100-$500, depending on the location and dentist. 2  Take-home whitening kits include custom-made trays and typically use a stronger bleaching agent than over-the-counter systems.
... NewsGroupQuestion wrote: How long is a UK cheque 'valid' i.e. how long can a person keep a cheque before presenting it to their bank and still have it honoured? Conventionally, six months.Some cheques have earlier expiries explicitly written on them.ow long is a UK Cheque 'valid'? I hope this is the right group to ask this question..... How long is a UK cheque 'valid' i.e. how long can a person keep a cheque. before presenting it to their bank and still have it honoured?
  you should not rely on any information that tells you that the check isn't good after six months. Here's why: if a check is more than six months old, your bank has two o â¦ ptions, either it can refuse to honor the check because of its date, or it can honor the check if it is not aware that you don't want it paid. personal check for the Bank of America is generally valid for at least thirty days. In many cases, these personal checks are valid for up to ninety days from the date of iss â¦ ue. Rachel Carter.