It only takes 1 piece of dental metal to destroy your friendly bacteria, 3 are known to cause sever problems and 5 is over whelming, those with 10+ have on ocassion been sterile and health so bad ansd even sever cancers. Tooth metals do damage 24/7 and eventually the body will loose the battle and it is not wise to loose the battle and then decide to remove the metals, it is not too late, but long past due by that time.