Don't know if they've stopped making it, but if you type 'Macleans toothpaste sensitive' into your search engine you should find various outlets that sell it.Alternatively contact them at their web site and ask them. CLICK HERE to go straight to their site.
I tried going to their site through the link, but was unable. My mother who is 87 years old has been an ardent Macleans user since 1930! She lives in Jeddah, Saudi Arabia and has great difficulty finding any Macleans. Where can I find Macleans for her in Saudi Arabia?? We are currently sourcing it through family travelling from the UK or Pakistan - but it is a hassle.