Meeting individuals’ social care needs is a core element of UK social policy. However, the conceptualisation and operationalisation of ‘unmet need’ remain a challenge. This paper advances our understanding by incorporating a temporal dimension into the conceptual framework on unmet need to investigate the dynamics of met and unmet need for social care over time. Using data from Waves 8 and 9 of the English Longitudinal Study of Ageing, this paper examines five possible trajectories among individuals with a social care need for bathing or dressing at baseline: (a) no longer having such a need; (b) having continued needs met; (c) delayed needs met; (d) newly arisen unmet needs; and (e) repeated unmet needs. The results indicate that amongst those with need at baseline, unmet need has decreased over time – indicating that some needs for social care may be fulfilled with a delay. However, a significant proportion of older people experienced repeated unmet needs, particularly those who were younger, with no spouse or civil partner, and those whose activities of daily living index scores worsened over time. Understanding the dynamics of unmet need can support policy makers in better ensuring that those facing an elevated risk of repeated unmet need over time do not fall through the social care safety net.