Jesin Adutwum, 17, was last seen at around 11.10pm on Sunday 25 August 2024 in the Chatham Hill area of the town.
He is described as being slim, around 5ft 4in and with braided hair, and was wearing a black tracksuit and black trainers.
Jesin has links to Canterbury, the wider east Kent area, and Milton Keynes in Buckinghamshire, where it is believed he may have travelled.
Detective Inspector Scott Relf of Kent Police sad: ‘Jesin has been missing for more than a week now and we are concerned for his welfare.
‘If anyone sees him or knows where he is, we encourage you to please get in touch by calling 999 and quoting reference 25-096.’
